MORTEXPRODUCTSINC.501TERMINALRDFORTWORTH,TEXAS76106 Page9
Figure 5: Ceiling Access Panel.
Table 13: Optional Ceiling Access Panels.
SECTION IV: AIR HANDLER & SUPPLY AIR
DUCT INSTALLATION
CASED AIR HANDLER SUPPLY DUCT
CONNECTIONS:
The horizontal Air Handler case can be mounted into the ceiling
so there can be a horizontal left supply air flow or a horizontal
right supply air flow. The supply plenum is attached and secured
to the horizontal Air Handler case duct flanges by use of screws.
Use a Non-tape sealant such as mastic or an aerosol sealant to
seal the plenum to prevent air leakage. The supply plenum must
be the same size as the supply air opening.
The supply duct system must be designed as to maintain a 0.20
inches of water static pressure through the entire supply duct
system.
The supply air ducts are must be properly sized to carry the
proper amount of air from the horizontal Air Handler unit to the
conditioned spaces. If a hole is to be cut in the supply plenum
the hole needs to be the same size as the supply duct(s). Use a
duct starting collar to attach the ducts to the plenum. Use a Non-
tape sealant such as mastic or an aerosol sealant to seal the
plenum to prevent air leakage.
If the cased horizontal Air Handler unit installed in an un-
conditioned space be sure the supply and return duct system is
insulated and installed in accordance with local codes.
UN-CASED AIR HANDLER SUPPLY DUCT
CONNECTIONS:
The horizontal Air Handler case can be mounted into the ceiling
so there can be a horizontal left supply air flow or a horizontal
right supply air flow. The supply plenum is attached and secured
to the horizontal Air Handler case duct flanges by use of screws.
Use a Non-tape sealant such as mastic or an aerosol sealant to
seal the plenum to prevent air leakage. The supply plenum must
be the same size as the supply air opening.
The supply duct system must be designed as to maintain a 0.20
inches of water static pressure through the entire supply duct
system.
The supply air ducts are must be properly sized to carry the
proper amount of air from the horizontal Air Handler unit to the
conditioned spaces. If a hole is to be cut in the supply plenum
the hole needs to be the same size as the supply duct(s). Use a
duct starting collar to attach the ducts to the plenum. Use a duct
starting collar to attach the ducts to the plenum. Use a Non-tape
sealant such as mastic or an aerosol sealant to seal the plenum to
prevent air leakage.
If the horizontal Air Handler unit installed in an un-conditioned
space be sure the supply and return duct system is insulated and
installed in accordance with local codes.
USING THE LOUVERED CEILING ACCESS PANEL
FOR AIR RETURN WILL RESULT IN A VERY LOUD
AND NOISY SITUATION.WHEN THE AIR HANDLER
UNIT IS OPERATING.
USING A DUCTED RETURN WILL RESULT IN A
MUCH QUITEIER SITUATION WHEN THE AIR
HANDLER UNIT IS OPERATING.
IMPACT HAZARD
Use extreme caution when removing the Ceiling
Access Panel screws. The panel is secured to the
frame assembly with the thumb screws. Once the
thumb screws have been removed the Ceiling Access
Panel will swing down very quickly. Anyone that
standing under the Ceiling Access Panel will get hit
with the panel unless the panel is supported by holding
it with their hands.
The louvers can also have sharp edges which can cut
hands or fingers. The use of gloves is recommended
when servicing the horizontal Air Handler unit.
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