combustion air vent calculation

2022.07.31
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combustion air vent calculation

2 0 obj 1873 0 obj <>stream 1. Free Air This type would not work for the example given. Free Air. Example: A boiler room has a 50,000 BTU gas fired water heater and a 100,000 BTU gas fired boiler. /CreationDate (D:20200226133700) << Find the total BTU being fired in the space in question. /ProcSet [/PDF /ImageB /ImageC /ImageI /Text] 7 0 obj << 1 0 obj << << Ikcx66deA (bB~JH ,`~bA!ZB HZAJ(&\jr endobj Answer: The free air space must be 50 square inches or a 10 x 5 inch opening to the outside of the building. /K false >> /c3d0d652-ca99-4206-ab17-7a58f91f7b96 18 0 R /Filter /FlateDecode /XObject << /60ab549b-59df-46a2-b7f8-c0a0f2b6157f 14 0 R If the number from step 2 is larger than the number from step 3 the space is considered confined. /CS /DeviceRGB /S /Transparency If no information is present, the following sizing percentages should be used: Wood/Plastic = 25% free area; Metal = 75% free area. hbbd```b``"WI0LlDjDr$6D%J$]+MFTd3W#Yk5KDx@$5pht:0)&E"@$dW006l(I9 C) stream The percentage of free air is 75%. %PDF-1.6 %

>> How big must the free air space opening to the outside be? 159 0 obj <> endobj What you need: Find the total cubic feet of space needed to support combustion and ventilation. hbbd``b`$W@H0, p%` 13 0 obj << In. /Group << 3. /Parent 7 0 R /Parent 2 0 R hbbd``b`9$ @a ' p. $XO rAJ 1 *@+Hld#]0 Bh >> >> All Rights Reserved. Multiply that by 50. >> 409 0 obj <>stream /Resources <<>> >> 2. << A 10 x 10 inch unmarked wood or plastic louver has a total of 100 Sq. In. /Contents [11 0 R 12 0 R 13 0 R] stream 100 Sq. Unlike non-direct vent heaters, this type of water heater is connected directly to the outside by two pipes. >> In. The percentage of free air is 25%. /K false ! " endstream endobj 160 0 obj <. endobj

/Length 4482 4. 1850 0 obj <>/Filter/FlateDecode/ID[<5E35277E7F0C0B499DE8FE2AC07CE6EC><283ECBB95CD00140B3326238281FBEE9>]/Index[1826 48]/Info 1825 0 R/Length 95/Prev 201155/Root 1827 0 R/Size 1874/Type/XRef/W[1 2 1]>>stream endstream Sizing the opening for outside air (NFPA Interpretation). %%EOF /Filter /FlateDecode /S /Transparency /Filter /FlateDecode >> >> 5 0 obj /6c2a12f0-b225-439b-aa2a-11ffbfed63ce 25 0 R Direct vent water heaters can be vented either horizontally or vertically offering more flexibility during installation. Ft. /d2ade7fb-bc6d-4433-8d0f-c88a72dd81fc 31 0 R 8w >> 9 0 obj >> % /388b5819-b2ea-4428-9e11-a7d58a975fb9 29 0 R /Kids [8 0 R] >> One opening, within 12 inches of the ceiling, shall be installed to the outside of the building and must have 1 square inch of free air for every 3000 BTUs fired in that space. /CS /DeviceRGB >> endstream endobj startxref << 268 0 obj <>stream x .75 = 75 Sq. In. # $ % &. This type would work for the example given. %%EOF endobj << (100,000 BTUs + 50,000 BTUs = 150,000 BTUs; 150,000 BTUs/3000 BTUs = 50 square inches). 6 0 obj /2cd58161-197d-458b-b417-45e58ba76bbe 30 0 R /Count 1 0 3. /Length 9 Complications: The above formula for free air space does not account for grills or louvers made of wood, plastic or metal. >> endobj >> 216 0 obj <>/Filter/FlateDecode/ID[]/Index[159 110]/Info 158 0 R/Length 149/Prev 95617/Root 160 0 R/Size 269/Type/XRef/W[1 3 1]>>stream /Fields [] endobj /Parent 2 0 R /Type /Pages %PDF-1.6 % /Kids [9 0 R] /Kids [5 0 R 6 0 R 7 0 R] /Group << /f4a52a2f-9c32-494f-b8b4-f7d7dae0049d 28 0 R %%EOF x^ R R /K false Ft > 6960 Cu. /Type /Pages >> >>

/Type /Page /Count 1 /Resources << endobj bwLb0] ]Wdo>`=rx` RMH L/A00?% -y#X 0 /Resources << %PDF-1.6 %

7000 Cu. /Resources << Combustion air must be acquired from another space.

x^} /Title (Combusion and Make Up Air Form) Do you have enough make-up air to support proper combustion? 0D^zF1I=?P(h&o#*.3f^NC`e! QG7gm}.fZ`x&{i~b"D3zTaukHeI0gPIMxl> In. hb``0g``Nc``` /c4a7d075-3c6a-475b-8ba6-63c7b4b8fe38 27 0 R What you have: Find the total cubic feet of space where the gas fired equipment is to be installed. x .25 = 25 Sq. 314 0 obj <> endobj 0 >> /I false tg76/_bksw/Q6]2!4(&s;D+Nnx'01"}MeKv83EF\VIDNc s!5C\c%P%>qt(gDBd]NHzYzG> ). This means the water heater uses outside air for combustion and not air used to heat or cool the building. Tech Tip: Do you have enough make-up air to support proper combustion? /Length 9 /CS /DeviceRGB /ProcSet [/PDF /ImageB /ImageC /ImageI /Text] 2. /Producer (SCOTT COUNTY) endstream endobj startxref /Parent 2 0 R Established in 1974 as a designer and fabricator of heat exchangers for the boiler and solar industries. stream endobj

endobj Today, HTP is enjoying its second generation of family leadership and is a full-fledged manufacturer on the cutting edge of energy-efficient space and water heating technology. Find the volume of space in question using this formula: Length x Height x Width = Volume in cubic feet. c `2010!#3M`LP2313X=fgzx)9i)]G020Fi@ZmYiz-+9CT8b*bb`z8X1Q ;!q /532aef7a-f20f-441b-8aef-324c4255c874 32 0 R << /Kids [10 0 R] << endstream endobj startxref endstream /XObject << %PDF-1.4 /Type /Catalog /Type /Page endobj stream /MediaBox [0 0 612 792] endobj >> Copyright 2022 HTP Comfort Solutions LLC. A 10 x 10 inch unmarked metal louver has a total of 100 Sq. /AcroForm 3 0 R 11 0 obj

4 0 obj /XObject << hb```Mn Ia"L!b'=$ )dSSWUSQUP2740%,bbjfngdimakj>+RX$:>!16kHFJjnZfNVzRrvQIiYa^~AqeWSCuU\-5mu=&O0OxH44I`u0hV9 B XA! 30dyDW]=27}`;04 30 . w@p q F@Y .H( R V CX:5.XsYxtFMaR`sfdXe: !=* 'g:H3q 5mzw TLZ^R^QYUUY\WXVZRklokamhcgnfjbd`o&&+%#-!/'.tTuLwrfmW3 B| endstream endobj 315 0 obj <. 8 0 obj 1. hb``e``a M1 Y8Z ](f`X d904020400K0 &p(Tn Tr+(J871 0?g/L[4stH+2+=v+Z%Ws&N4q8fb`Q30 ` >> /Parent 6 0 R In. /Count 1 /Filter /FlateDecode /MediaBox [0 0 612 792] 100 Sq. /MediaBox [0 0 612 792] 361 0 obj <>/Filter/FlateDecode/ID[<6951F7323A33784284026894B7F03EB6><8115B3E59821BE4E8F21E9EAEA6A947C>]/Index[314 96]/Info 313 0 R/Length 123/Prev 55884/Root 315 0 R/Size 410/Type/XRef/W[1 2 1]>>stream 10 0 obj >> /8253683d-95b5-4cef-b00a-f412fe6c0fa4 22 0 R endobj << /Parent 5 0 R /Contents [15 0 R 16 0 R 17 0 R] /I false 3 0 obj << Solution: The total cubic feet needed is greater than the total cubic feet available and the space is considered confined. endstream endobj 1827 0 obj <. Verifying if a space is confined: Example: A 100,000 BTU gas fired boiler and a 50,000 BTU gas fired water heater are being installed in a room that is 30 feet long, 29 feet wide and has 8 foot high ceilings. >> 1826 0 obj <> endobj >> Combustion Problems?

Direct vent water heaters always have access to an adequate supply of combustion air and will never create negative air pressure or function inefficiently. /Font << x^]ms|m< aL>8vm7ug]RTDIz-H:9:JX,%iTX4>, 8(b0D t;xq"{89M x^+ r r /XObject << /Contents [19 0 R 20 0 R 21 0 R] /Type /Page /Count 3 /MediaBox [0 0 595 842] /Pages 2 0 R /1cb40afc-1a4c-48a0-89bf-e434c67fc89f 26 0 R /Creator (SCOTT COUNTY) /Length 174 /Author (Schussler, Jeremy) /S /Transparency endobj /ProcSet [/PDF /ImageB /ImageC /ImageI /Text] This will total the number of cubic feet of space that is needed to support combustion. H3,$$+t $~XrG$Tt^v. >>

/Type /Pages

>> >> > B 12 0 obj /Group << Some grills/louvers have the total of free air space pertaining to that grill or louver. << /Type /Pages /I false