<< Return to Previous Page

Conveyor Belt Ventilation


Conveyor Belt Ventilation

Text Version

Conveyor Belt Ventilation
Conveyor Types:
  1. Conveyor transfer less than 3' fall. For greater fall, provide additional exhaust at lower belt (see #3).
    he = 0.25 VPd
  2. Conveyor to elevator with magnetic separator.
    he = 0.25 VPd
  3. Chute to belt transfer and conveyor transfer, greater than 3' fall. Use additional exhaust for dusty material as follows:
    Belt width 12"-36", Q = 700 cfm
    Belt width above 36", Q = 1,000 cfm
    he = 0.25 VPd
    Note: Dry, very dusty materials may require exhaust flowrates 1.5 to 2.0 times stated values.
Design Data
  • Transfer points:
    Enclose to provide 150 - 200 fpm indraft at all openings. (underground mining tunnel ventilation will interfere with conveyor exhaust systems.)
  • Detail of Belt Opening. 2" Clearance for load on belt.
  • Q = 350 cfm/ft belt width for belt speeds under 200 fpm. (minimum)
    Q = 500 cfm/ft belt width for belt speeds over 200 fpm and for magnetic separators. (minimum)
    Duct velocity = 4,200 - 4,500 fpm
    he = 0.25 VPd
  • Conveyor Belts:
    Cover belt between transfer points
    Exhaust at transfer points
    Exhaust additional 350 cfm/ft of belt width at 30' intervals. Use 45° tapered connections.
From American Conference of Governmental Industrial Hygienists (ACGIH®), Figure VS-50-20, Industrial Ventilation : A Manual of Recommended Practice, 23rd Edition. Copyright 1998. Reprinted with permission.