Specifications

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3000270 05.12
3.4 Multiple Fans on Steel Chimney
  Iftwoormorechimneyfansarerequiredtocreatesufcientdraft, 
installation procedures are the same as for single fan installation on
a steel chimney. The only difference is that the fans are sitting next
to each other on the top of the chimney. A special adapter plate
is required.
When installing multiple fans, it is extremely important that the fans
are of the same model and size, and they must be controlled in
tandem by one (1) motor speed control.
3.5 Multiple Fans on a Brick Chimney - Oversized Flue
  Iftwoormorefansarerequiredtocreatesufcientdraft,aspecial 
adapter plate is required. The adapter plate should be made of
stainless steel (14 GA or thicker), depending on the size and the fan
models used.
The two holes in the plate should match the throat diameter of the
fan model used and the distance from center to center should be at
least equal to the fan width (dimension “B” in 1.5. Dimensional Data).
The adapter should be sealed with silicone and bolted onto the top.
When installing multiple fans, it is extremely important that the fans
are of the same model and size, and they must be controlled
in tandem by one (1) motor speed control.
  Asimilarapproachshouldbetakeniftheuesizeexceedsthefan 
base dimensions. The adapter plate should be sized so it covers
  theueandsecured.Aholeshouldbecutinthecenteroftheplate 
and the fan mounted centered over the hole.
3.6 Installation for High Temperatures
  Ifthefanisusedforapplicationswheretheuegastemperatures 
  exceed400°Fattheueexit,anddoesnotexceed650°F,dilution 
bolts must be used.
  Dilutionboltswillcausecoolairtodilutethewarmuegas,bylifting
the fan and leaving space so the cool air can get in under the fan
base.
The dilution bolts should be installed in the outer holes in the fan
base.
The dilution bolts are adjustable and should be adjusted so the
  uegastemperaturedoesnotexceed400°Fwhendischarged 
through the fan. When using dilution bolts the fan’s actual capacity
  isreducedandastrongermodelmayberequired.Thebermatis 
not required when using dilution bolts
.