Model 200DX
::
Ultimateair.com
::
Athens, Ohio 45701 :: 740.594.2277
General Ducting Guidelines
The
duct installation should follow the following standards:
a.
Mechanical integrity
The system will remain as built for the life
of the building, without developing leaks, obstructions, or
insulation failures.
b.
Freedom from leaks
All air moved by the air handler will be
drawn from and delivered to the intended conditioned spaces.
c.
Proper insulation
Conditioned air should Not exchange heat
with Unconditioned spaces.
A licensed HVAC contractor should do the duct design calculations.
To minimize backpressure: Make the intake and exhaust duct runs as
short and straight as possible. Use 45-degree elbows instead of 90-degree
where practical. Where flex duct is used, make sure that no “crimping” or
“collapsing” of the duct occurs. Stretch flex duct evenly to avoid air
restriction. Use “Y” connections instead of “T” connections wherever
possible. Size ductwork according to recognized industry standards such
as Manuals D and J, published by the Air Conditioning Contractors of
America (ACCA).
•
Use the minimum length of flexible duct possible
•
Minimize any noise transmission through the ducts by using a short
run (2-3 ft) of insulated flex duct on duct trunks coming from
the unit and going to the inside of the house.
•
Position outdoor fresh air intakes away from known sources of
pollution. A six-foot separation is the recommended distance
between the Fresh air intake and stale air exhaust. Locate
Intake and Exhaust 40 inches from the corner of the building,
and above the projected snow plane.
•
Position inside grill/register vents so that fresh air does not blow
directly onto occupants or the thermostat.
•
Fasten joints between duct components with screws, sealant, and/or
rivets and wrap them with metal foil duct tape to ensure no
leaks.
