OPINION BY
Judge McCULLOUGH.
Air-Serv Group, LLC (ASG) petitions for review of the May 21, 2008, order of the Board of Finance and Revenue, which sustained an order of the Pennsylvania Department of Revenue’s Board of Appeals (Board) denying ASG’s petition for a sales tax refund.
ASG owns, installs, maintains, and services coin operated air vending machines, which are located in gas stations and convenience stores.1 The air vending machines operate as follows:
4. ... When activated, [ASG’s] air vending machines pump air from the atmosphere through a compressor. The compressed air is pumped through a hose into customers’ automobile tires or other inflatable objects. The air vending machines do not dispense stored compressed air.
5. [ASG] charges a fee for the right to use the air vending machine for a specific number of minutes, normally three minutes. During the period in question, [ASG] charged customers 75 cents ($0.75) to operate the air vending machine for the designated number of minutes. The charge does not vary by the amount of the air placed into a tire or tires or the time during which the pump is operated. The charge relates to the time the air vending machine is available to perform as stated above.
6. [ASG] pays nothing for the air that is taken from the atmosphere. Over time, the air that is pumped into a cus[450]*450tomer’s tire or other inflatable device returns to the atmosphere....
(Stipulation of Facts, ¶¶ 4-6.)
On or about December 16, 1999, following a request by ASG, the Pennsylvania Department of Revenue (Department) issued a private letter ruling (the 1999 PLR) in which it concluded that sales from air vending machines are not subject to sales tax under section 202(a) of the Tax Reform Code of 1971 (Code).2 Based on that ruling, ASG did not charge or collect sales tax from its customers or remit any monies to the Department based on receipts from the machines. The 1999 PLR was valid for a period of five years.
The 1999 PLR expired on December 15, 2004. On September 13, 2005, ASG filed a request with the Department to renew the 1999 PLR for a second five-year period. However, the Department advised ASG that it no longer had access to ASG’s original request and asked ASG to submit a new request for a private letter ruling. ASG did so on November 21, 2005.
By letter dated January 25, 2006, the Department issued a new private letter ruling (the 2006 PLR), in which the Department concluded that sales from ASG’s air vending machines are subject to the sales tax. The Department relied upon Commonwealth v. Air Products and Chemicals, Inc., 475 Pa. 318, 380 A.2d 741 (1977), which held that the act of separating atmospheric air into its constituent gases constitutes manufacturing. In Air Products, our Supreme Court considered whether on-site “customer stations” for providing gas products constituted manufacturing. The issue before the court was described as follows:
Air Products’ business of separating from the atmosphere and converting into liquid and thence into gas the component elements is, all would concede, manufacturing.... Our initial inquiry, however, is whether that aspect of a customer station which executes the last step of the process — transforming the liquid product to a gas with the proper temperature and pressure — is, standing alone, within the definition.
Id., 475 Pa. at 323-24, 380 A.2d at 743 (footnote omitted). The court held that, despite having a storage function, customer stations also serve a manufacturing purpose because they convert a liquid substance into a gas at a certain flow and temperature. The court explained:
Our guide here must be the two-part test peculiar to the Tax Act of 1963, and we have no doubt that it has been met in this case: The type of activity performed at the customer station, i.e., conversion from liquid to gas, even if not ‘manufacturing, fabricating, compounding, [or] processing,’ is at least an ‘operation’ within the broad dictionary definition given that word in [ Commonwealth v. ] Sitkin’s Junk [ Co., 412 Pa. 132, 194 A.2d 199 (1963) ] ..., i.e., ‘the action of making or producing something.’ 412 Pa. at 139, 194 A.2d at 203. Similarly, the second part of the test is satisfied since the result of the process which the liquid product undergoes in the customer station is to place it ‘in a form, composition or character different from that in which it is acquired.’
Id., 475 Pa. at 324, 380 A.2d at 744. Because the separation of atmospheric air into its constituent gases is manufacturing under section 201(c) of the Code, 72 P.S. § 7201(c), the Department reasoned that [451]*451atmospheric air must be tangible personal property.
When the 1999 PLR expired in December of 2004, ASG commenced paying sales tax on the receipts from its air vending machines. ASG paid the tax itself and did not increase the fee charged to its customers. Subsequently, on May 17, 2007, ASG filed a petition with the Board for a refund of the sales tax it paid on sales from its vending machines in the amount of $253,831.75. Following a hearing, the Board denied the petition for the reasons set forth in the 2006 PLR.
ASG appealed to the Board of Finance and Revenue, which concluded that ASG failed to establish that sales from the air vending machines are not subject to the sales tax. The members of the Board of Finance and Revenue were, however, equally divided: the Attorney General, Secretary of Revenue, and General Counsel voted to sustain the Board’s order; the State Treasurer, Auditor General, and Secretary of the Commonwealth dissented. ASG’s petition for review to this Court ensued.
ASG raises two issues for review,3 both of which are of first impression: (1) whether dispensing air from an air vending machine is a sale of “tangible personal property” subject to the sales tax under section 202(a) of the Code, and (2) whether the process of using a vending machine to pump air is a service subject to the sales tax as a “sale at retail” pursuant to section 202(a).4
This is a statutory construction case, and our goal in interpreting a statute is to ascertain and effectuate the intent of the legislature. Dechert, LLP v. Commonwealth, 606 Pa. 334, 998 A.2d 575 (2010). When the words of a statute are clear and free from all ambiguity, the letter of the statute is not to be disregarded under the pretext of pursuing its spirit. Id. Further, statutes imposing taxes are to be strictly construed, and any doubt or uncertainty as to the imposition of a tax must be resolved in favor of the taxpayer; however, such doubt is only implicated after the court’s efforts at statutory interpretation yield no definitive conclusion. Id.
I. Is dispensing air from, an air vending machine a sale of “tangible personal propertg” subject to the sales tax under section 202(a) of the Code?
The term “tangible personal property” is defined by the Code as follows:
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OPINION BY
Judge McCULLOUGH.
Air-Serv Group, LLC (ASG) petitions for review of the May 21, 2008, order of the Board of Finance and Revenue, which sustained an order of the Pennsylvania Department of Revenue’s Board of Appeals (Board) denying ASG’s petition for a sales tax refund.
ASG owns, installs, maintains, and services coin operated air vending machines, which are located in gas stations and convenience stores.1 The air vending machines operate as follows:
4. ... When activated, [ASG’s] air vending machines pump air from the atmosphere through a compressor. The compressed air is pumped through a hose into customers’ automobile tires or other inflatable objects. The air vending machines do not dispense stored compressed air.
5. [ASG] charges a fee for the right to use the air vending machine for a specific number of minutes, normally three minutes. During the period in question, [ASG] charged customers 75 cents ($0.75) to operate the air vending machine for the designated number of minutes. The charge does not vary by the amount of the air placed into a tire or tires or the time during which the pump is operated. The charge relates to the time the air vending machine is available to perform as stated above.
6. [ASG] pays nothing for the air that is taken from the atmosphere. Over time, the air that is pumped into a cus[450]*450tomer’s tire or other inflatable device returns to the atmosphere....
(Stipulation of Facts, ¶¶ 4-6.)
On or about December 16, 1999, following a request by ASG, the Pennsylvania Department of Revenue (Department) issued a private letter ruling (the 1999 PLR) in which it concluded that sales from air vending machines are not subject to sales tax under section 202(a) of the Tax Reform Code of 1971 (Code).2 Based on that ruling, ASG did not charge or collect sales tax from its customers or remit any monies to the Department based on receipts from the machines. The 1999 PLR was valid for a period of five years.
The 1999 PLR expired on December 15, 2004. On September 13, 2005, ASG filed a request with the Department to renew the 1999 PLR for a second five-year period. However, the Department advised ASG that it no longer had access to ASG’s original request and asked ASG to submit a new request for a private letter ruling. ASG did so on November 21, 2005.
By letter dated January 25, 2006, the Department issued a new private letter ruling (the 2006 PLR), in which the Department concluded that sales from ASG’s air vending machines are subject to the sales tax. The Department relied upon Commonwealth v. Air Products and Chemicals, Inc., 475 Pa. 318, 380 A.2d 741 (1977), which held that the act of separating atmospheric air into its constituent gases constitutes manufacturing. In Air Products, our Supreme Court considered whether on-site “customer stations” for providing gas products constituted manufacturing. The issue before the court was described as follows:
Air Products’ business of separating from the atmosphere and converting into liquid and thence into gas the component elements is, all would concede, manufacturing.... Our initial inquiry, however, is whether that aspect of a customer station which executes the last step of the process — transforming the liquid product to a gas with the proper temperature and pressure — is, standing alone, within the definition.
Id., 475 Pa. at 323-24, 380 A.2d at 743 (footnote omitted). The court held that, despite having a storage function, customer stations also serve a manufacturing purpose because they convert a liquid substance into a gas at a certain flow and temperature. The court explained:
Our guide here must be the two-part test peculiar to the Tax Act of 1963, and we have no doubt that it has been met in this case: The type of activity performed at the customer station, i.e., conversion from liquid to gas, even if not ‘manufacturing, fabricating, compounding, [or] processing,’ is at least an ‘operation’ within the broad dictionary definition given that word in [ Commonwealth v. ] Sitkin’s Junk [ Co., 412 Pa. 132, 194 A.2d 199 (1963) ] ..., i.e., ‘the action of making or producing something.’ 412 Pa. at 139, 194 A.2d at 203. Similarly, the second part of the test is satisfied since the result of the process which the liquid product undergoes in the customer station is to place it ‘in a form, composition or character different from that in which it is acquired.’
Id., 475 Pa. at 324, 380 A.2d at 744. Because the separation of atmospheric air into its constituent gases is manufacturing under section 201(c) of the Code, 72 P.S. § 7201(c), the Department reasoned that [451]*451atmospheric air must be tangible personal property.
When the 1999 PLR expired in December of 2004, ASG commenced paying sales tax on the receipts from its air vending machines. ASG paid the tax itself and did not increase the fee charged to its customers. Subsequently, on May 17, 2007, ASG filed a petition with the Board for a refund of the sales tax it paid on sales from its vending machines in the amount of $253,831.75. Following a hearing, the Board denied the petition for the reasons set forth in the 2006 PLR.
ASG appealed to the Board of Finance and Revenue, which concluded that ASG failed to establish that sales from the air vending machines are not subject to the sales tax. The members of the Board of Finance and Revenue were, however, equally divided: the Attorney General, Secretary of Revenue, and General Counsel voted to sustain the Board’s order; the State Treasurer, Auditor General, and Secretary of the Commonwealth dissented. ASG’s petition for review to this Court ensued.
ASG raises two issues for review,3 both of which are of first impression: (1) whether dispensing air from an air vending machine is a sale of “tangible personal property” subject to the sales tax under section 202(a) of the Code, and (2) whether the process of using a vending machine to pump air is a service subject to the sales tax as a “sale at retail” pursuant to section 202(a).4
This is a statutory construction case, and our goal in interpreting a statute is to ascertain and effectuate the intent of the legislature. Dechert, LLP v. Commonwealth, 606 Pa. 334, 998 A.2d 575 (2010). When the words of a statute are clear and free from all ambiguity, the letter of the statute is not to be disregarded under the pretext of pursuing its spirit. Id. Further, statutes imposing taxes are to be strictly construed, and any doubt or uncertainty as to the imposition of a tax must be resolved in favor of the taxpayer; however, such doubt is only implicated after the court’s efforts at statutory interpretation yield no definitive conclusion. Id.
I. Is dispensing air from, an air vending machine a sale of “tangible personal propertg” subject to the sales tax under section 202(a) of the Code?
The term “tangible personal property” is defined by the Code as follows:
(m) “Tangible personal property.” Corporeal personal property including, but not limited to, goods, wares, merchandise, steam and natural and manufactured and bottled gas for non-residential use, electricity for non-residential use, prepaid telecommunications, premium cable or premium video programming service, spirituous or vinous liquor and malt or brewed beverages and soft [452]*452drinks, interstate telecommunications service originating or terminating in the Commonwealth and charged to a service address in this Commonwealth, intrastate telecommunications service with the exception of (i) subscriber line charges and basic local telephone service for residential use and (ii) charges for telephone calls paid for by inserting money into a telephone accepting direct deposits of money to operate, provided further, the service address of any intrastate telecommunications service is deemed to be within this Commonwealth or within a political subdivision, regardless of how or where billed or paid. In the case of any such interstate or intrastate telecommunications service, any charge paid through a credit or payment mechanism which does not relate to a service address, such as a bank, travel, credit or debit card, but not including prepaid telecommunications, is deemed attributable to the address of origination of the telecommunications service.
Section 201(m) of the Code, 72 P.S. § 7201(m) (emphasis added). The meaning of the term “tangible personal property” is further explained by the following regulation:
(3) The term tangible personal property includes, but is not limited to, the following:
(i) Goods, wares and merchandise, other than household supplies purchased from retail establishments for residential consumption.
(ii) Steam, electricity and fuel oil, when not purchased directly by the user solely for his own residential use.
(iii) Natural, manufactured or bottled gas when not purchased directly by the user solely for his own residential use.
(iv) Intrastate telephone and telegraph service for nonresidential use.
(v) Spirituous or vinous liquor.
(vi) Malt and brewed beverages.
(vii) Soft drinks.
61 Pa.Code § 31.1(3) (emphasis added).
ASG argues that the air dispensed from its air vending machines is not tangible personal property because: (1) the Supreme Court’s decision in Air Products stands for the proposition that atmospheric air is not tangible personal property; (2) atmospheric air is outside the definition of corporeal personal property set forth in section 201 (m) of the Code; (3) air is not like the steam and natural and manufactured and bottled gas described in the statute; and (4) the atmosphere is not personal property.
On the other hand, the Commonwealth contends that compressed air is tangible and corporeal in nature because it can be perceived, felt, and possessed, and that pressurized air delivered from ASG’s vending machines is not the equivalent of atmospheric air. The Commonwealth asserts that the fact that “air” is not expressly included in the Code does not preclude taxation. In addition, the Commonwealth observes that the Supreme Court never stated in Air Products that air is not tangible personal property. The Commonwealth also asserts that the Department’s interpretation of the law is entitled to deference.
The stipulated facts reflect that air vending machines operate by pumping air from the atmosphere through a compressor, which forces air into tires or other inflatable objects. The parties also stipulated that the air vending machines do not dispense stored compressed air. Moreover, the parties attached as an exhibit to the stipulations the expert affidavit of William S. Otte, Jr., a mechanical engineer who works in the air compressor industry. Otte opined that air compressors do not change the chemical composition of air or [453]*453the mixture of the air that is pumped through the device but merely compress the air to a selected number of pounds per square inch. Although the parties did not stipulate to Otte’s opinions, we find Otte’s opinions to be credible and accept them as fact.
The Code, regulations, and case law indicate that air taken from the atmosphere is taxable only when it has been changed, separated, processed and/or bottled and then sold commercially. Section 201(m) of the Code and the applicable regulations specifically identify as taxable specific products such as steam and natural and manufactured and bottled gases that are sold for non-residential purposes. Air that exists freely in the atmosphere is quite unlike products such as steam, natural gas, manufactured gas, and bottled gas, all of which are commercially produced, distributed, and/or packaged.5 Further, our Supreme Court’s decision in Air Products is instructive. Air Products concluded that the process of creating gas products via an industrial process where air is cooled to such a degree that it becomes a liquid, thereby allowing the air to separate into its component gases, and the process of converting such liquids into gases, constituted manufacturing. Although the Supreme Court did not decide whether atmospheric air is tangible personal property, Air Products illustrates that a manufactured product did not come into existence until air was transformed by an industrial process.
Moreover, for air to be taxable it must be “tangible personal property.” The term “personal property” is defined as “any moveable or intangible thing that is subject to ownership and not classified as real property.” Black’s Law Dictionary 1337 (9th ed.2009) (emphasis added). While air is a material substance, air has been historically treated as res communes, which means “[t]hings common to all; things that cannot be owned or appropriated, such as light, air, and the sea.” [454]*454Black’s Law Dictionary 1421, 1427 (9th ed.2009). See Who Owns the Sky? Seventh Annual Lloyd K. Garrison Lecture on Environmental Law, 18 Pace Envtl. L.Rev. 227 (2001). This principle is consistent with Article I, § 27 of the Pennsylvania Constitution, which declares that “Pennsylvania’s public natural resources are the common property of all the people, including generations yet to come.” Thus, because the atmosphere is not subject to ownership by any private individual, group, or entity, we conclude that it is not personal property.6
Here, ASG’s vending machines do not sell a product that has been changed, altered, or bottled, but rather draw air freely from the atmosphere via a compressor. As observed by Otte, compressed air is not chemically different from atmospheric air; the only distinction is the pressure of the air. Also, ASG stipulated that it is charging a fee only for the right to use the machine for a fixed number of minutes. (Stipulation ¶ 5.) ASG is not charging customers for the air itself. Therefore, we conclude that the air dispensed from ASG’s air vending machines is not tangible personal property subject to the sales tax.
II. Is the process of using a vending machine to pump air a service subject to the sales tax as a “sale at retail” pursuant to section 202(a)?
ASG contends that the process of using a vending machine to pump air is not a service subject to the sales tax under Section 202(a) of the Code, which imposes the sales tax “upon each separate sale at retail of ... services.... ”
The term “sale at retail” is defined by the Code, in pertinent part, as follows:
(3) The rendition for a consideration of the service of—
(i) Washing, cleaning, waxing, polishing or lubricating of motor vehicles of another, whether or not any tangible personal property is transferred in conjunction therewith; and
(ii) Inspecting motor vehicles pursuant to the mandatory requirements of “The Vehicle Code.”
(4) The rendition for a consideration of the service of repairing, altering, mending, pressing, fitting, dyeing, laundering, drycleaning or cleaning tangible personal property other than wearing apparel or shoes, or applying or installing tangible personal property as a repair or replacement part of other tangible personal property except wearing apparel or shoes for a consideration, whether or not the services are performed directly or by any means other than by coin-operated self-service laundry equipment for wearing apparel or household goods and whether or not any tangible personal property is transferred in conjunction therewith, except such services as are rendered in the construction, reconstruction, remodeling, repair or maintenance of real estate: Provided, however, That this subclause shall not be deemed to impose tax upon such services in the preparation for sale of new items which are excluded from the tax under clause (26) of section 204, or upon diaper service.
Section 201(k)(3), (4) of the Code, 72 P.S. § 7201(k)(3), (4). The Department’s regulations state that the following services are subject to the sales tax:
(i) Cleaning, inspecting, lubricating, polishing, washing or ivaxing motor ve-[455]*455hides whether performed directly or by coin-operated equipment.
(ii) Wrapping or packaging tangible personal property.
(iii) Applying or installing tangible personal property as a repair or replacement part of personal property other than clothing or shoes.
(iv) Altering, cleaning, dry-cleaning, dyeing, fitting, laundering, mending, pressing or repairing tangible personal property other than clothing or shoes.
(v) The imprinting or printing of tangible personal property furnished by others.
(vi) The labor or services billed by the vendor for delivering, installing or applying tangible personal property sold by the vendor even if the services are contracted for separately.
61 Pa.Code § 31.1(4) (emphasis added).
ASG argues that the fee charged for the air vending service is not a sale at retail because air is not tangible personal property and the service provided by ASG is not enumerated in section 201 (k) of the Code. Also, ASG asserts that the charge is related to the amount of time the air vending machine operates and that the service is the opportunity during that time to inject air from the atmosphere into a tire or other inflatable device.
The Commonwealth, on the other hand, argues that a customer inflating a flat tire is engaged in altering, mending or repairing tangible personal property as defined in section 201(k)(4) of the Code and 61 Pa.Code § 31.1(4). Other coin-operated services for motor vehicles are subject to the sales tax, such as self-service car wash sales. See McCarthy Car Wash, Inc. v. Commonwealth, 94 Pa.Cmwlth. 551, 503 A.2d 1088 (1986) (holding that services provided at a self-service car wash constituted a “sale at retail” for sales tax purposes). Further, the Commonwealth compares air vending machines to vacuum vending machines because both the 1999 PLR and 2006 PLR subject sales from such machines to tax.
We observe that air vending services are not within the specifically enumerated taxable services set forth in either section 201(k) of the Code or 61 Pa.Code § 31.1(4), and we conclude that air vending is not analogous to any of the services enumerated in the statute and regulation. Moreover, the parties did not stipulate or submit evidence to show that ASG’s customers use air vending machines to “alter, repair, or mend” damaged tires or other inflatable objects as such terms are used in the Code or in any other manner. The act of injecting air into an inflatable object is clearly not comparable to the types of taxable services specifically set forth in the statute and regulations — repairing, altering, mending, pressing, fitting, dyeing, laundering, cleaning, and dry cleaning — most of which apply to textiles, and not inflatable devices.7 Rather, the parties stipulated that ASG is selling its customers an entirely different kind of service: the opportunity to use the vending machine’s compressor to pump air for a fixed period of time. (Stipulation ¶ 5.)
Although the Commonwealth correctly observes that coin operated services such [456]*456as self-service car washes are taxable, the legislature has specifically provided that cleaning, inspecting, lubricating, polishing, washing or waxing motor vehicles services, whether performed directly or by coin-operated equipment, are taxable. Section 201(k)(3)(i) of the Code and 61 Pa.Code § 31.1(4)(i). The legislature has not similarly provided that coin operated air vending services are taxable. Therefore, we conclude that the process of using a vending machine to pump air is not a taxable service within the definition of “sale at retail.”8
The Commonwealth argues that the Board of Finance and Revenue’s interpre[457]*457tation of the law is entitled to deference. However, this is a statutory interpretation case and our standard of review over questions of law is plenary. See Commonwealth v. Gilmour Manufacturing Co., 573 Pa. 143, 822 A.2d 676 (2003) (in a challenge to the validity of a regulation, our Supreme Court stated that the meaning of a statute is essentially a question of law for the court, and, when convinced that the interpretative regulation adopted by an administrative agency is unwise or violative of legislative intent, courts disregard the regulation). Because its decision is not supported by the statute, we do not defer to the Board of Finance and Revenue’s interpretation of the Code and regulations.
Accordingly, we reverse.
Senior Judge FRIEDMAN concurs in result only.
ORDER
AND NOW, this 14th day of April, 2011, the May 21, 2008, order of the Board of Finance and Revenue is hereby REVERSED.
This order shall become final unless exceptions are filed within thirty days pursuant to Pa. R.A.P. 1571(i).