MH INDUSTRIAL EXHAUST FANS - Aerovent

Typical Specifications – Type MH-OW
Fans shall be of the SWSI MH-OW Industrial Centrifugal type, as manufactured by Aerovent, Minneapolis, Minnesota, and
shall be of the size, class, arrangement, and capacity as indicated in the fan schedule. Centrifugal fans shall be tested and rated in
accordance with industry accepted test codes and are guaranteed by Aerovent to deliver rated performance. In addition, each fan
shall be factory run tested prior to shipment.
CONSTRUCTION — The housing shall be constructed of heavy gauge steel with continuous seam type welding and side angle
reinforcement. The housing discharge, complete with flanged inlet and outlet, shall be field rotatable for sizes 12" through 25".
Lifting eyes shall be supplied on all sizes.
WHEEL — The blades of the OW wheel shall be flat, single thickness radial type, continuously welded to a spider type hub. The
wheel shall be dynamically and statically balanced and shall be attached to the fan shaft with a split taper lock bushing or furnished
with straight bore hubs.
BEARINGS — Bearings shall be pillow block design, oversized to ensure maximum bearing life and shall have a minimum L-10
life as defined by AFBMA of at least 40,000 hours (200,000 hours average life).
DRIVE — The belts and sheaves furnished by the manufacturer shall be selected to provide a minimum 1.4 service factor when
measured against motor horsepower.
MOTOR — Fan motors shall be foot-mounted NEMA Design B, standard industrial, continuous duty, ball bearing, variable
torque type suitable for operation on voltage, phase and hertz, as listed in the fan schedule. Motor bearings shall have a minimum
L-10 life, as defined by AFBMA, of at least 40,000 hours (200,000 hours average life).
BALANCING — The wheel assembly shall be statically and dynamically balanced in accordance with ANSI / AMCA 204-96
“Balance Quality and Vibration Levels for Fans” to Fan Application Category BV-3, Balance Quality Grade G6.3. In addition,
direct drive fan wheels shall be balanced on the motor shaft after final assembly and belt driven fan wheels shall be balanced on
the fan shaft after final assembly in the fan casing, in the manufacturing facility, to the following peak velocity values, filter-in, at
the fan test speed:
Fan Application Rigidly Mounted Flexibly Mounted
Category (in./s) (in./s)
BV-3 0.15 0.20
FINISH — The unit, after fabrication, shall be cleaned and chemically pretreated by a phosphatizing process and shall be painted
inside and outside with an air dry enamel.
Fans shall be coated with the following optional finish:
• Plasite 4310 Vinyl Ester
• Farboil Baked Aromatic Epoxy
• Plasite 7122L/Heresite VR506
• Plasite 3070 Baked Phenolic
• Epoxy Phenolic • Carbocoat 30 (Replaces Sanitile 550 and Eisenheiss 210)
• Plasite 3055
• Air-Dried Epoxy
ACCESSORIES:
• Heavy Duty Construction
• Weather Cover
• Heat Fan Construction
• Narrow Width Construction
• Quick Opening Cleanout Door
• Inlet Guard
• Bolted Cleanout Door
• Split Housing
• Housing Drain
• Unitary Base
• Belt Guard
• RIS or Spring Isolators
• Shaft Seal • Spark Resistant Construction (Type A, B, or C)
• Outlet Damper
• External Inlet Vanes
• Shaft and Bearing Guard
55 Aerovent Bulletin 705