Greenheck Fan 129 manual

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Table of contents for the manual

  • Page 1

    FAN FUNDAMENTAlS 129 Intr oduction to F AN SELECTION This is a guide to the most basic fan sections, all of which enable you to select the right fan for the job. It will answer the following questions (and more) : • What is a SONE? • How are model numbers and performance tables used to select a fan? • How are direct drive and belt driven fans[...]

  • Page 2

    FAN FUNDAMENTAlS 130 BEL T DRIVE One advantage of choosing a belt drive over a direct drive is that it is capable of adjusting the fan rpm, which enables the fan to move more air if necessary . Motor pulleys are adjusted by loosening the set screw and turning the top half of the pulley (see illustrations at right). This causes the pulley diameter t[...]

  • Page 3

    FAN FUNDAMENTAlS 131 Exhaust fan to be sized 8 ft. 40 ft. 30 ft. Louvers to supply Makeup air DETERMINING CFM A ft er th e m od el is kn ow n, th e c fm mu st be de te rm in ed . C on su lt lo ca l c od e r eq ui r em en ts or th e t ab le be lo w f or suggested air changes for pr oper ventilation. The ranges specified will adequately ventilate the[...]

  • Page 4

    FAN FUNDAMENTAlS 132 ST A TIC PRESSURE GUIDELINES STATIC PRESSURE GUIDELINES Nonducted 0.05 in. to 0.20 in. Ducted 0.2 in. to 0.40 in. per 100 feet of duct (assuming duct air velocity falls within 1000-1800 feet per minute) Fittings 0.08 in. per fitting (elbow, register, grill, damper, etc.) Kitchen Hood Exhaust 0.625 in. to 1.50 in. Static pressur[...]

  • Page 5

    FAN FUNDAMENTAlS 133 Example Solution SOUND LEVELS In ma ny cas es, the so und ge ner at ed by a fa n mus t be co nsid ere d. Fo r th e fan in dust ry , a comm on un it for expressing sound pressur e level is the sone. In practical te rms, th e lou dn es s of one so ne is eq uiva len t to th e soun d of a quiet refrigerator heard from five feet awa[...]