5
OWNER’S MANUAL
DUCT WORK AND AIR DISTRIBUTION
Proper air distribution is important in an indoor
swimming pool room to prevent condensation on windows,
and improve comfort. The quantity of supply air and the
velocity of air from the air distribution system should be of
sufficient volume to cover all areas of exterior glass,
skylights and patio doors with warm, dry air. This is the only
remedy to keep exterior glass and skylights from moisture
and condensation build-up.
IMPORTANT
ALL DUCT DESIGN AND CONSTRUCTION
MUST CONFORM WITH THE LATEST
ASHRAE AND SMACNA
LOW VELOCITY DUCT STANDARDS
Refer to DCA manual for air volumes and static pressure
specifications of units. Special attention should be given to
the following areas to achieve desired results.
1. Supply air from registers should be directed on
outside walls and away from the swimming and spa
surfaces. Make sure that all outside walls and entire
surface of exterior glass surfaces are covered with
supply air.
2. Return air inlet should be located high in the room as
possible to prevent air stratification.
Make sure that
supply air does not short cycle back to the return
inlet.
If dehumidifier is installed without return air
duct, provide a minimum of 4 feel clearance between
unit and closest obstruction.
3. The recommended duct materials are standard
galvanized sheet metal, aluminum or PVC pipe. All
elbows should be of low restriction. Ductwork must
be insulated on the outside if located in areas that are
unconditioned to prevent condensation and heat loss.
Use flexible duct connectors to attach ductwork to
the DCA unit to eliminate any vibrations.
4. Grilles, registers and diffusers should be selected on
the basis of low noise criteria (NC) noise levels, CFM
requirements as well as air diffusion patterns to cover
cold surfaces with conditioned air. Choose hardware
resistant to deterioration from the presence of
chemicals in the pool room atmosphere. 100 CFM per
register is recommended.
5. Ceiling fans can be used, local codes permitting, to
insure more complete air circulation. Make sure that
air is directed upward to avoid drafts that can result
in increased water evaporation.
IMPORTANT
POOR DUCT DESIGN AND INSTALLATION
WILL RESULT IN UNEVEN AIR DISTRIBUTION,
POOR OPERATING PERFORMANCE,
REDUCED MOISTURE REMOVAL, MOISTURE FORMATION
ON EXTERIOR GLASS AND SKYLIGHTS
AND INCREASED OPERATING COSTS.
Typical Duct Installations
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