15
FIGURE 15. ROOFCURB
space as possible allowing clearances
as indicated. Run ducts as directly as
possible to supply and return outlets.
Use of non-flammable weatherproof
flexible connectors on both supply and
return connections at unit to reduce
noise transmission is recommended.
On ductwork exposed to outside
temperature and humidity, use a
minimum of 2” of insulation and a vapor
barrier. Distribution system in attic, furred
space or crawl space should be
insulated with at least 2” of insulation.
1
/2”
to 1” thick insulation is usually sufficient
for ductwork inside the air conditioned
space.
Provide balancing dampers for each
branch duct in the supply system.
Properly support ductwork from the
structure.
IMPORTANT: In the event that the return
air ducts must be run through an
“unconfined” space containing other fuel
burning equipment, it is imperative that
the user/building owner must be
informed against future changes in
construction which might change this to
a “confined space.” Also, caution the
user/building owner against any future
installation of additional equipment (such
as power ventilators, clothes dryers,
etc.), within the existing unconfined
and/or confined space which might
create a negative pressure within the
vicinity of other solid, liquid, or gas fueled
appliances.
FIGURE 14. LIFTING DETAIL
!
WARNING
RETURN AIR
NEVER ALLOW PRODUCTS OF
COMBUSTION OR THE FLUE
PRODUCTS TO ENTER THE RETURN
AIR DUCTWORK, OR THE
CIRCULATING AIR SUPPLY. ALL
RETURN DUCTWORK MUST BE
ADEQUATELY SEALED AND
SECURED TO THE FURNACE WITH
SHEET METAL SCREWS, AND JOINTS
TAPED. ALL OTHER DUCT JOINTS
MUST BE SECURED WITH APPROVED
CONNECTIONS AND SEALED
AIRTIGHT.
FAILURE TO PREVENT PRODUCTS OF
COMBUSTION FROM BEING
CIRCULATED INTO THE LIVING SPACE
CAN CREATE POTENTIALLY
HAZARDOUS CONDITIONS,
INCLUDING CARBON MONOXIDE
POISONING THAT COULD RESULT IN
PERSONAL INJURY OR DEATH.
ST-A0886-12
ST-A0888-02
ST-A0888-02
FIGURE 16. ROOFCURB
To Next Page
Loading...
Need help?
General
