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Operable Fresh Air Intakes

Question asked by bpeck on Jun 14, 2019

NFPA 96 - Ventilation Control and Fire Protection of Commercial Cooking Operations

I have a restaurant on the first floor of a three story building.  The exhaust fan terminates on a side wall at the first floor level.  There are several glass windows above the exhaust fan.  The windows are locked from the inside but there is nothing preventing someone from unlocking and opening a window.


Section 7.8.3 Wall Terminations states that 

(1) The termination shall be through a noncombustible wall with a minimum of 3 m (10 ft) of clearance from the
outlet to adjacent buildings, property lines, grade level, combustible construction, electrical equipment or lines,
and with the closest point of any air intake or operable door or window at or below the plane of the exhaust

(2) The closest point of any air intake or operable door or window above the plane of the exhaust termination shall
be a minimum of 3 m (10 ft) in distance, plus 76 mm (3 in.) for each 1 degree from horizontal, the angle of
degree being measured from the center of the exhaust termination to the center of the air intake or operable
door or window, as indicated in Figure 7.8.3.


Question 1) Does the minimum 10 ft clearance include natural gas piping?

Question 2) Is a "locked" window no longer an operable window?  If not, if the window is screwed shut is it no longer an operable window?

Question 3) Is there a requirement for a fire rating on the glass in the windows? 


I know there are other issues with this installation but the questions above are currently the hot topics.


Thank you.