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Instructions
EXHAUSTBLOWER RATINGS
450
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 buck drafting. Follow the heating equipment manufacturer's
guidelines and safety standards such us those published by the National Fire Protection Association
(NFPA), t he American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) a nd
local code authorities.
NOTE: The exhaust blower output is upproximutelg
400 CFM (cubic feet per minute) without
ductwork. Each installation is different and ductwork affects blower output uccordinglg. 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.
Exomples: 50 equivalent feet of ductwork has approximately
320 CFM.
100 equivalent feet of ductwork has upproximutelg
265 CFM.
Downdroft
Cooktop
Exhoust Blower CFM
u_
U
O
lI
35O
300
250
200
150
i00
50
0
0
25
50
75
100
6" Diometer
Equivolent
Duct Length
125
150
19
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