combustion air vent calculation

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In. 2. /Length 9 /Title (Combusion and Make Up Air Form) /Parent 2 0 R A 10 x 10 inch unmarked wood or plastic louver has a total of 100 Sq. <<

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condensing gas fired boilers boiler water domestic building indirect /ProcSet [/PDF /ImageB /ImageC /ImageI /Text]

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12 0 obj air pressure system simple ductwork sure way there What you have: Find the total cubic feet of space where the gas fired equipment is to be installed.

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Unlike non-direct vent heaters, this type of water heater is connected directly to the outside by two pipes.

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Direct vent water heaters always have access to an adequate supply of combustion air and will never create negative air pressure or function inefficiently.

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/ProcSet [/PDF /ImageB /ImageC /ImageI /Text] Find the total BTU being fired in the space in question.

100 Sq. Find the volume of space in question using this formula: Length x Height x Width = Volume in cubic feet. %PDF-1.6 % Answer: The free air space must be 50 square inches or a 10 x 5 inch opening to the outside of the building. %PDF-1.4

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Direct vent water heaters can be vented either horizontally or vertically offering more flexibility during installation.

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314 0 obj <> endobj /I false /XObject << 3. Solution: The total cubic feet needed is greater than the total cubic feet available and the space is considered confined. Sizing the opening for outside air (NFPA Interpretation). >> /Type /Pages Combustion air must be acquired from another space.

8 0 obj /Kids [10 0 R] Combustion Problems? air combustion shall input btu minimum opening total per inch each square area 1000 The percentage of free air is 75%. >> 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.

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A 10 x 10 inch unmarked metal louver has a total of 100 Sq. /I false

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Complications: The above formula for free air space does not account for grills or louvers made of wood, plastic or metal.

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Do you have enough make-up air to support proper combustion?

This means the water heater uses outside air for combustion and not air used to heat or cool the building. In. air boiler combustion requirements figure forgotten element rooms nationalboard tg76/_bksw/Q6]2!4(&s;D+Nnx'01"}MeKv83EF\VIDNc s!5C\c%P%>qt(gDBd]NHzYzG> ). x .25 = 25 Sq. air gas fuel codes opening combustion code vent single space than iccsafe Example: A boiler room has a 50,000 BTU gas fired water heater and a 100,000 BTU gas fired boiler.

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8w 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. /60ab549b-59df-46a2-b7f8-c0a0f2b6157f 14 0 R concentric vent exhaust air combustion through same adventures repair 3 0 obj combustion testing procedures fan draft furnaces boilers assist drilled hole should Ft > 6960 Cu. stream stream

This will total the number of cubic feet of space that is needed to support combustion. 100 Sq. 409 0 obj <>stream /Pages 2 0 R

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! " Multiply that by 50. /f4a52a2f-9c32-494f-b8b4-f7d7dae0049d 28 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.

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If no information is present, the following sizing percentages should be used: Wood/Plastic = 25% free area; Metal = 75% free area.

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/Group << /Count 1 What you need: Find the total cubic feet of space needed to support combustion and ventilation. /K false <<

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x .75 = 75 Sq. endobj >> /XObject <<

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(100,000 BTUs + 50,000 BTUs = 150,000 BTUs; 150,000 BTUs/3000 BTUs = 50 square inches). /Type /Catalog

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/S /Transparency The percentage of free air is 25%.

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combustion air ducts horizontal endobj /2cd58161-197d-458b-b417-45e58ba76bbe 30 0 R If the number from step 2 is larger than the number from step 3 the space is considered confined. /MediaBox [0 0 612 792] >>

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