GE PGP989TNWW Use and Care Manual - Page 21

Exhaust Blower Safety Warning, Exhaust Blower Ratings, Step 1, Examples

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Installation Instructions EXHAUST BLOWER RATINGS EXHAUST BLOWER SAFETY WARNING Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of other fuel burning equipment to prevent back drafting. Follow the heating equipment manufacturer's guidelines and safety standards such as those published by the National Fire Protection Association (NFPA), the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) and local code authorities. NOTE: The exhaust blower output is approximately 400 CFM (cubic feet per minute) without ductwork. Each installation is different and ductwork affects blower output accordingly. Actual blower exhaust CFM can be approximated using the graph below. Step 1: Calculate the "equivalent duct length" using the "DUCTWORK CALCULATIONS" table in these instructions for your installation. Step 2: Find the approximate intersection point of the blower exhaust performance curve with the equivalent duct length to estimate the actual maximum blower output for your installation. Examples: 50 equivalent feet of ductwork has approximately 320 CFM. 100 equivalent feet of ductwork has approximately 265 CFM. Downdraft Cooktop Exhaust Blower CFM 450 Air Flow (CFM) 400 350 300 250 200 150 100 50 00 25 50 75 100 125 150 6" Diameter Equivalent Duct Length 21

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21
Installation Instructions
EXHAUST BLOWER SAFETY WARNING
Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of
other fuel burning equipment to prevent back drafting. Follow the heating equipment manufacturer’s
guidelines and safety standards such as those published by the National Fire Protection Association
(NFPA), the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) and
local code authorities.
NOTE:
The exhaust blower output is approximately 400 CFM (cubic feet per minute) without
ductwork. Each installation is different and ductwork affects blower output accordingly. Actual
blower exhaust CFM can be approximated using the graph below.
Step 1:
Calculate the “equivalent duct length” using the “DUCTWORK CALCULATIONS” table in
these instructions for your installation.
Step 2:
Find the approximate intersection point of the blower exhaust performance curve with
the equivalent duct length to estimate the actual maximum blower output for your
installation.
Examples:
50 equivalent feet of ductwork has approximately 320 CFM.
100 equivalent feet of ductwork has approximately 265 CFM.
Downdraft Cooktop Exhaust Blower CFM
Air Flow (CFM)
6” Diameter Equivalent Duct Length
450
400
350
300
250
200
150
100
50
0
0
25
50
75
100
125
150
EXHAUST BLOWER RATINGS