F – Ductwork Connection
INM.XX.X.00 F-1 April, 2018
Ductwork Connection
Ductwork Layout Considerations
Though ductwork layout is outside of scope of dehumidifier installation and duct connection to it, it is crucial to
have proper ductwork layout for proper air distribution throughout the premise and proper dehumidifier
operation. Proper ductwork layout encompasses, among others, following:
Supply air must be directed/properly distributed to:
o exterior windows and doors, skylights, etc.
o breathing zone at the deck level and water surface.
o remainder of the room to ensure there are no stagnant areas.
Return duct grille must be located where it will optimize the entire airflow pattern (central/equidistant
location of return grille, multiple return grilles if needed, etc.).
Air short-circuiting must be prevented – no supply air diffusers near the return.
Ensure grilles, diffusers and registers are delivering proper throw distance and CFM.
Maintain the required minimum OA intake along with negative pressure in the space (respective Exhaust Fan
and OA intake arrangement)
Where/if applicable, establish direct exhaust of humid/chemical laden air from the source (locate exhaust
grille above/close to spa, whirlpool, etc.).
Duct sock installation: sock must be levelled (hangers are at the same heights), stretched and not sagging.
Duct Connection – General Considerations
All duct connections should be done in accordance with local and national standards.
o Proper duct turns and transitions (sizing, distance, angles, turn vanes, etc.) should be used to minimize air
friction losses and turbulence and to ensure the highest fan efficiency.
o If space heater (electric heater, hot water coil or gas duct heater) is installed at the dehumidifier
supply air termination, heater becomes a point for the supply duct connection – ensure proper
duct transition, support, etc. is in place – refer to heater manufacturer guidance as needed.
o Flexible connectors (canvas collars, etc.) should be used to prevent (reduce) vibration and sound
propagation.
Ductwork should not interfere with other devices/systems operation and accessibility:
o fasteners (screws, etc.) attaching ducts to the damper, are not interfering with damper linkage,
actuator(s) wiring and mounting brackets etc.
o fasteners (screws etc.) are not interfering/penetrating any internal wiring, piping etc. possibly located
behind the surface(s) ductwork is attached to – verify visually before installation and after.
o damper actuator(s), filter racks, etc. are accessible/not blocked by the installed ductwork.
CAUTION! Obtain all necessary documentation (Dectron documentation, submittal documentation,
drawings etc.) and familiarise yourself with it before performing installation or any other related tasks.
Refer to dehumidifier submittal drawings for location and size of dehumidifier duct connections.
WARNING! All work must be done by qualified personnel in accordance with local and national Codes,
Standards and Regulations as well as respective design/submittal documentation and Dectron recommendations.
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