2. /Length 4482
>> /388b5819-b2ea-4428-9e11-a7d58a975fb9 29 0 R /MediaBox [0 0 612 792] /Parent 7 0 R
1873 0 obj <>stream
7000 Cu. /Type /Catalog Combustion Problems?
endstream endobj 315 0 obj <. Sizing the opening for outside air (NFPA Interpretation). /Contents [11 0 R 12 0 R 13 0 R] x^} /Length 9
x^]ms|m< aL>8vm7ug]RTDIz-H:9:JX,%iTX4>, 8(b0D t;xq"{89M # $ % &. 268 0 obj <>stream
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/2cd58161-197d-458b-b417-45e58ba76bbe 30 0 R
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. endobj
Combustion air must be acquired from another space. /Type /Pages
/Fields [] > B /ProcSet [/PDF /ImageB /ImageC /ImageI /Text] /Count 1 endstream endobj 160 0 obj <. %PDF-1.6 % 7 0 obj
>> bwLb0] ]Wdo>`=rx` RMH L/A00?% -y#X endstream endobj startxref Ft. 12 0 obj /Filter /FlateDecode
%PDF-1.4 hb``e``a M1 Y8Z ](f`X d904020400K0 &p(Tn Tr+(J871 0?g/L[4stH+2+=v+Z%Ws&N4q8fb`Q30 ` %%EOF /c4a7d075-3c6a-475b-8ba6-63c7b4b8fe38 27 0 R Free Air This type would not work for the example given. 159 0 obj <> endobj 100 Sq. /K false 13 0 obj endobj /S /Transparency /AcroForm 3 0 R Multiply that by 50.
>> Do you have enough make-up air to support proper combustion? /Contents [15 0 R 16 0 R 17 0 R] Find the total BTU being fired in the space in question. >> << /Group << /Type /Pages 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. If no information is present, the following sizing percentages should be used: Wood/Plastic = 25% free area; Metal = 75% free area. 409 0 obj <>stream
2 0 obj /Length 9
<< >> How big must the free air space opening to the outside be?
<< << endstream 3 0 obj >> /XObject << /I false 8w << In. 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 endobj /Parent 6 0 R
/Contents [19 0 R 20 0 R 21 0 R] 2. endobj Some grills/louvers have the total of free air space pertaining to that grill or louver. /Filter /FlateDecode This type would work for the example given. 3. 8 0 obj << >>
/I false (100,000 BTUs + 50,000 BTUs = 150,000 BTUs; 150,000 BTUs/3000 BTUs = 50 square inches). If the number from step 2 is larger than the number from step 3 the space is considered confined. 0 /Length 174 >> endobj Unlike non-direct vent heaters, this type of water heater is connected directly to the outside by two pipes. hbbd``b`9$ @a ' p. $XO rAJ 1 *@+Hld#]0 Bh endobj endstream endobj startxref /f4a52a2f-9c32-494f-b8b4-f7d7dae0049d 28 0 R This will total the number of cubic feet of space that is needed to support combustion. Find the volume of space in question using this formula: Length x Height x Width = Volume in cubic feet. /MediaBox [0 0 612 792] 1. The percentage of free air is 75%. endobj /CS /DeviceRGB /Count 1 In. >> Established in 1974 as a designer and fabricator of heat exchangers for the boiler and solar industries. /Producer (SCOTT COUNTY) 10 0 obj >>
%PDF-1.6 % /S /Transparency %PDF-1.6 % /Parent 2 0 R This means the water heater uses outside air for combustion and not air used to heat or cool the building. %%EOF /Count 1 stream 4 0 obj
endobj
hb```Mn Ia"L!b'=$ )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| /MediaBox [0 0 612 792] In. endstream >> stream
100 Sq. Answer: The free air space must be 50 square inches or a 10 x 5 inch opening to the outside of the building. 314 0 obj <> endobj 0D^zF1I=?P(h&o#*.3f^NC`e! QG7gm}.fZ`x&{i~b"D3zTaukHeI0gPIMxl> << /Resources << c `2010!#3M`LP2313X=fgzx)9i)]G020Fi@ZmYiz-+9CT8b*bb`z8X1Q ;!q % 3. >>
1 0 obj >> /d2ade7fb-bc6d-4433-8d0f-c88a72dd81fc 31 0 R Ft > 6960 Cu. x .25 = 25 Sq. What you have: Find the total cubic feet of space where the gas fired equipment is to be installed.
/Parent 5 0 R
<< /8253683d-95b5-4cef-b00a-f412fe6c0fa4 22 0 R
/Resources <<>> x .75 = 75 Sq. Complications: The above formula for free air space does not account for grills or louvers made of wood, plastic or metal. 5 0 obj hb``0g``Nc``` Ikcx66deA (bB~JH ,`~bA!ZB HZAJ(&\jr /60ab549b-59df-46a2-b7f8-c0a0f2b6157f 14 0 R << /6c2a12f0-b225-439b-aa2a-11ffbfed63ce 25 0 R /I false What you need: Find the total cubic feet of space needed to support combustion and ventilation. endstream endobj startxref /XObject << In.
<< >> /Type /Page >> 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 /Parent 2 0 R /Kids [10 0 R] /Parent 2 0 R /Filter /FlateDecode >> Copyright 2022 HTP Comfort Solutions LLC. endstream endobj 1827 0 obj <. >> /CreationDate (D:20200226133700) /532aef7a-f20f-441b-8aef-324c4255c874 32 0 R /Type /Page The percentage of free air is 25%. All Rights Reserved. 0 /Resources << /Group << >> /Kids [9 0 R] << /1cb40afc-1a4c-48a0-89bf-e434c67fc89f 26 0 R /Group << endobj >> endobj tg76/_bksw/Q6]2!4(&s;D+Nnx'01"}MeKv83EF\VIDNc s!5C\c%P%>qt(gDBd]NHzYzG> ). /Type /Pages /Type /Page /XObject << /ProcSet [/PDF /ImageB /ImageC /ImageI /Text] Direct vent water heaters can be vented either horizontally or vertically offering more flexibility during installation. /Type /Pages
Direct vent water heaters always have access to an adequate supply of combustion air and will never create negative air pressure or function inefficiently. Example: A boiler room has a 50,000 BTU gas fired water heater and a 100,000 BTU gas fired boiler. /CS /DeviceRGB /ProcSet [/PDF /ImageB /ImageC /ImageI /Text] /c3d0d652-ca99-4206-ab17-7a58f91f7b96 18 0 R Free Air. /XObject << 11 0 obj x^+ r r A 10 x 10 inch unmarked wood or plastic louver has a total of 100 Sq.
<< 0
H3,$$+t $~XrG$Tt^v. hbbd``b`$W@H0, p%` In.
/Count 3 /Creator (SCOTT COUNTY) /Resources << /K false
/Author (Schussler, Jeremy) /Kids [5 0 R 6 0 R 7 0 R] /Title (Combusion and Make Up Air Form) >> >>
>>
stream %%EOF >> /Font << 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 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. stream 1. << ! " hbbd```b``"WI0LlDjDr$6D%J$]+MFTd3W#Yk5KDx@$5pht:0)&E"@$dW006l(I9 C) /Kids [8 0 R] /Pages 2 0 R
A 10 x 10 inch unmarked metal louver has a total of 100 Sq. x^ R R
/K false endobj In. >> /S /Transparency >> /Filter /FlateDecode Tech Tip: Do you have enough make-up air to support proper combustion? 1826 0 obj <> endobj /MediaBox [0 0 595 842] 6 0 obj /CS /DeviceRGB
9 0 obj endobj Solution: The total cubic feet needed is greater than the total cubic feet available and the space is considered confined. 4.