Greenheck Fan 90, 55 Rail Mounting, Ductwork Connections, Supply Weatherhood, Exhaust Weatherhood

RAIL MOUNTING

Rail Layout

•Rails designed to handle the weight of the HRE should be positioned as shown on the diagram (rails by others)..

•Make sure that rail positioning does not interfere with the supply air discharge opening or the exhaust air intake opening on the HRE unit.. Avoid area dimensioned “B” below

•Rails should run the width of the unit and extend beyond the unit a minimum of 12 inches on each side..

•Set unit on rails.

OUTDOOR

AIR

INTAKE

HOOD

SUPPLY/EXHAUST

OPENING

B A

Side view of HRE on rails

Isometric view of HRE on rails

Model	Rail Mounting
	A	B
HRE-20	5..1	25..0
HRE-45	7..1	25..1
HRE-55	5..7	35..0
HRE-90	6..6	36..1

All dimensions shown are in inches..

DUCTWORK CONNECTIONS

Examples of good and poor fan-to-duct connections are shown below.. Airflow out of the fan should be directed straight or curve the same direction as the fan wheel rotates.. Poor duct installation will result in low airflow and other system effects..

R

		tion
	a
t
o

Length of Straight Duct

R

		tion
	a
t
o

GOOD

POOR

Recommended Discharge Duct Size and Length

HRE Model	HRE Blower Size	Duct Size	Straight Duct Length
HRE-20	10	14 x 14	40
HRE-45	12	20 x 20	48
HRE-55	15	28 x 28	60
HRE-90	18	32 x 32	72

Dimensions shown are in inches..

SUPPLY WEATHERHOOD

Supply weatherhood will be factory mounted..

EXHAUST WEATHERHOOD

The exhaust weatherhood is shipped separately as a kit with its own instructions..

Dampers

Backdraft dampers are always included as an integral part of the exhaust hood assemblies.. Motorized outdoor air and exhaust air dampers are optional and are factory mounted (and wired) at the inlet..

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