Guide Specs

SERIES 37 FIBERGLASS BELT DRIVE UPBLAST ROOF VENTILATOR SK-880-37 NOVEMBER, 1997

The Fiberglass Belt Drive Upblast Roof Ventilator shall be manufactured by Hartzell Fan, Inc.®, Series 37. Standard sizes are 12" through 60". Sizes 12" through 40" shall be completely assembled, packaged and ready to install. Sizes 44" through 60" shall be shipped in three parts; curb panel, fan and stack cap each completely assembled, with hardware for installation.

The resin used on the Series 37 roof ventilator shall be Ashland Hetron 693 which is a polyester resin with 3% antimony oxide added to achieve a Class I flame spread rate below 25 per ASTM E84 tunnel test standards and NFPA Code 91 for blower and exhaust systems, which is OSHA approved. Construction shall conform to ASTM Standard D4167 for fiber reinforced plastic fans and blowers.

Fiberglass fan housings and components may be used in temperatures up to 200° F. The propeller shall be airfoil design, 6 bladed one piece construction through the 48" size with an aluminum insert molded into the hub for secure attachment to the shaft. The 54" and 60" sizes shall be composed of either 4 or 6 blades securely clamped in a 2-piece hub. The hub is assembled with Type 304 stainless steel bolts and mounted on the fan shaft with a tapered bushing.

Fan housings, stack cap lids, windband channels, mounting angle, and curb panel are constructed of solid fiberglass including the flanges which have drilled mounting holes. Motor mountings shall be steel plate coated with resin and mounted on the drum exterior with glass mat, cloth, and resin. The encapsulated assembly base, zinc plated steel riser bolts and epoxy coated motor base provide support for the motor. All other hardware, including windband support brackets and lid axles shall be Type 304 stainless steel. Lid bearings shall be nylon.

Fan shafts shall be ground and polished Type 304 stainless steel. Bearings shall be located in a drive compartment sealed to prevent corrosive element entry which shall include a shaft seal and slinger. Bearings shall be heavy duty, self-aligning, and shall have extended lube tubes and be relubricable for continuous service with a minimum L10 life of 50,000 hours. Variable pitch sheaves shall be standard on fans up to and including 10 HP.

The fan assembly shall be dynamically balanced at the Hartzell factory prior to shipping. Fans shall be balanced in accordance with AMCA Standard 204-96, fan application category BV-3 (comparable to Grade G6.3). Fans shall be manufactured in accordance with Hartzell's standard quality assurance procedures. Fan performance shall be based on tests conducted in Hartzell's AMCA accredited test laboratory and in accordance with AMCA Standard 210 for air performance and AMCA Standard 300 for sound. Fans shall be licensed to bear the AMCA Certified Air and Sound Performance Rating Seal.