10
Figure 6 - Fan Clearance Details
HVLS fans installed in buildings equipped with sprinklers, including ESFR (Early Suppression, Fast
Response) sprinklers, shall comply with the following:
• The maximum fan diameter shall be 24 ft (7.3 m).
• The HVLS fan shall be centered approximately between four adjacent sprinklers. The vertical
clearance from the HVLS fan to sprinkler deflector shall be a minimum of 3 ft. (0.9 m).
• All HVLS fans shall be interlocked to shut down immediately upon receiving a water-flow signal from
the alarm system in accordance with the requirements of NFPA 72.
NOTE: Contractor is responsible for verifying all site conditions to include field dimensions where
applicable. If the contractor elects to make any changes without notification, the contractor is
responsible for the changes. All drawings are to be used as general architectural intent unless
otherwise stamped. See engineering drawings for structural design information. Contractor to
ensure that all building departments and authorities are informed concerning the work, and all
permits are obtained before beginning work.
24” 26”
Fan Frame
Sloped Roof
48” Min
144”
24”
18”
24”
60”
Flat Roof
= Obstruction
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