Friction Rate Calculator
	Manufacturer's Blower Data (ESP @ Fan Speed = CFM)
	External Static Pressure (ESP)								"wc
						@	Low Med. Low Medium Med. High High Variable		Speed
						=			CFM
	Device Pressure Losses (DPL)
	typical values								Comments
	0.1 - 0.5			Refrigerant or hot water coil
	0.05 - 0.1			Low efficiency filter
	0.1 - 0.5			Mid or high efficiency filter
	0.06 - 0.15			Electronic Air Cleaner
	0.03			Supply register or diffuser
	0.03			Return grille
	0.03			Balancing damper
				Other device
		Total device pressure losses (DPL)						0.27	"wc
		Available Static Pressure (ASP)						0.19	"wc
	Total Effective Length (TEL)					TEL = equivalent length of fittings + length of duct
Supply TEL			Return TEL				TEL=	260	ft
Design Friction Rate							0.07		"wc/100ft