Fan(s) in kitchens, in addition to kitchen air conditioning and forced air kitchen heat for home indoor ventilation

	It shall be considered indicative that
	A common rule of thumb for rangetop exhaust fans in commercial applications is 300 cubic feet per minute exhaust capacity per each linear foot of rangetop
	A commonly applied rule for sizing rangetop exhaust fans in home application is a minimum 100 cubic feet per minute from the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 62.  See http://www.automatedbuildings.com/news/jan03/articles/ebtron/ebt.htm

In any case, the range hood shall be not less in width than the

	Rangetop width and
	Preferably to 6 linear inches wider, evenly

Shall be vented to the exterior only

	Note that exterior does not mean crawlspace
	Note that exterior does not mean attic

Shall vent only to atmosphere - outside, outside, outside

	Not to attic
	Not to soffit interior
	not to crawlspace

Shall have vent pitched down not up to minimize draft when the fan is idle
 

Kitchen exhaust fan vent(s) shall not exit a home exterior within 10 linear feet of

	A soffit vent
	An operable window
	A door
	An operable skylight
	A deck platform and 10 linear feet above and below
	A balcony platform and 10 linear feet above and below
	A walkway or pathway and 10 linear feet above
	A seating area and 10 linear feet above
	The horizontal foot print of an exterior staircase and 10 linear feet above and below
	Any other vent, including a chimney stack