GE PVM1790 Installation Instructions Manual

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GE PVM1790 Installation Instructions Manual Manual pdf 5 page image

Installation InstructionsNOTE: If you need to install ducts, note that the total ductlength of 3VJ' x 10" rectangular or 6" diameter round ductshould not exceed 140 equivalent feet.Outside ventilation requires a HOOD EXHAUSTDUCT.Read the following carefully.NOTE: It is important that venting be installed usingthe most direct route and with as few elbows as possible.This ensures clear venting of exhaust and helps preventblockages. Also, make sure dampers swing freely andnothing is blocking the ducts.Exhaust connection:The hood exhaust has been designed to mate witha standard 3½" x 10" rectangular duct.If a round duct is required, a rectangular-to-roundtransition adaptor must be used. Do not use less thana 6" diameter duct.Maximum duct length:For satisfactory air movement, the total duct length of3½" x 10" rectangular or 6" diameter round duct shouldnot exceed 140 equivalent feet.Elbows, transitions, wall and roof caps, etc.,present additional resistance to airflow and are equivalentto a section of straight duct which is longer than their actualphysical size. When calculating the total duct length, add theequivalent lengths of all transitions and adaptors plus thelength of all straight duct sections. The chart below showsyou how to calculate total equivalent ductwork length usingthe approximate feet of equivalent lengthof some typical ducts.EQUIVALENT NUMBER EQUIVALENTDUCTPIECES LENGTH x USED = LENGTHRectangular-t0-R0und 5 Ft. x ( ) = Ft.TransitionAdapt0€__ Wall Cap 40 Ft. x ( ) = Ft.(_ g0° Elbow 10 Ft. x ( ) = Ft.45° Elbow 5 Ft. x ( ) = Ft.g0° Elbow 25 Ft. x ( ) = Ft.45°EIb0w 5Ft. x ( ) = Ft.RoofCap 24 Ft. x ( ) = Ft.Straight Duct6" Roundor 1 Ft. x ( ) = Ft.3W'x 10" RectangularTotal Ductwork = Ft.* IMPORTANT:If a rectangular-to-round transition Equivalent lengths of duct pieces are based on actual tests andadaptor is used, the bottom corners of the damper reflect requirements for good venting performance with any ventwill have to be cut to fit, using the tin snips, in order hood.to allow free movement of the damper.5