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21
DUCTWORK INSTALLATION
Duct Sizing Suggestions
Correct ductwork design is critical to insure proper system performance. The total length of the ductwork
is the length of the return air duct plus the supply air duct. It is recommend that the ductwork and
register selection should follow ACCA manual D duct design to insure proper velocity and air flow.
Capacity Size (BtuH) 18K 24K 30K 36K 42K 48K
Air Flow Rate (CFM) 585 820 820 1175 1175 1470
Ext. Static Pressure (InWg) 0.1 0.1 0.15 0.15 0.15 0.2
Model Supply Air Outlet Return Air Inlet
ABCD
UMAT18HP230V1AD 4-7/8 (123) 29 (736) 28 (710) 6-1/2 (166)
UMAT24HP230V1AD 6-1/4 (158) 32-1/4 (818) 39-1/8 (994) 7-5/8 (195)
UMAT30HP230V1AD 6-1/4 (158) 32-1/4 (818) 39-1/8 (994) 7-5/8 (195)
UMAT36HP230V1AD 6-1/4 (158) 32-1/4 (818) 39-3/8 (1000) 8-1/8 (206)
UMAT42HP230V1AD 6-1/4 (158) 32-1/4 (818) 39-3/8 (1000) 8-1/8 (206)
UMAT48HP230V1AD 7-1/2 (190) 33-1/2 (850) 37 (940) 11-1/4 (286)
SUPPLY AIR OUTLET/RETURN AIR INLET DIMENSIONS in (mm)
NOMINAL EXT. STATIC PRESSURE
B
21mm(7/8inch)
A
Duct Connection Requirements
Side View Supply Air Outlet
Return Air Intlet
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