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Installation Preparation
Indoor Air Flow Data
using an inclined manometer or magnehelic gauge,
Use the air flow correction multipliers contained in
listed conditions. Under no circumstances should
of the SPVU under these conditions will result in
inadequate air flow leading to poor performance and/
or premature component failure.
Chart A - CFM - Determining the Indoor CFM
Fan Speed
Rated CFM at High Speed:
For single speed thermostats connect to the GL terminal for
thermostats will use both terminals.
Chart B - Correction Multipliers
Correct CFM (if needed)
Correction Multipliers for:
Heating
Cooling
Your airflow should be balanced based on many
factors, such as available ESP, room CFM, and
ductwork. Consult an HVAC engineer for proper
measured with a manometer or pitot tube. Once this
ESP is established, you can calculate the CFM using
the above chart.
Higher CFMs tend to increase S
enhance room circulation and increase duct noise,
while lower CFMs tend to increase L
and reduce noise.
8
Models
Low
High
CFM
325
255
Ductwork
a recognized method such as the equal friction
method, or velocity reduction method, using the
appropriate duct calculator(s) for the type(s) of duct
taking into consideration all fittings, registers and/or
diffusers. DO NOT operate unit without a supply
duct attached.
configuration to perform properly.
(ESP) available can be estimated from the charts to
the left. Use these charts to select your fan speed
setting.
duct.
increase static pressure.
NOTICE:
cause airflow restrictions. Do not use flex duct
for 90° bends or unsupported runs of 5 ft. or
more.
capacity
Flex duct can collapse and
49-5000431 Rev. 1
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