GE CVM2072 Installation Instructions Manual

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GE CVM2072 Installation Instructions Manual Manual pdf 5 page image

EQUIVALENT NUMBER EQUIVALENTDUCT PIECES LENGTH x USED = LENGTHRectangular-to-Round 1.5 m x ( ) = mTransition Adaptor* (5 Ft.) x ( ) = ( Ft.)Wall Cap 12.2 m x ( ) = m(40 Ft.) x ( ) = ( Ft.)90° Elbow 3 m x ( ) = m(10 Ft.) x ( ) = ( Ft.)45° Elbow 1.5 m x ( ) = m(5 Ft.) x ( ) = ( Ft.)90° Elbow 7.6 m x ( ) = m(25 Ft.) x ( ) = ( Ft.)45° Elbow 1.5 m x ( ) = m(5 Ft.) x ( ) = ( Ft.)Roof Cap 7.4 m x ( ) = m(24 Ft.) x ( ) = ( Ft.)Straight Duct 15.2 cm (6”) Round 0.3 m x ( ) = mor 8.3 x 25.4 cm (3¼” x 10”) (1 Ft.) x ( ) = ( Ft.)RectangularTotal Ductwork = m ( Ft.)Equivalent lengths of duct pieces are based on actual testsand reflect requirements for good venting performancewith any vent hood.* IMPORTANT: If a rectangular-to-round transitionadaptor is used, the bottom corners of the damperwill have to be cut to fit, using the tin snips, in orderto allow free movement of the damper.NOTE: If you need to install ducts, note that the totalduct length of 8.3 x 25.4 cm (3¼” x 10”) rectangular or15.2 cm (6”) diameter round duct should not exceed42.7 m (140 feet).Outside ventilation requires a HOOD EXHAUST DUCT.Read the following carefully.NOTE: It is important that venting be installed using themost 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 with astandard 8.3 x 25.4 cm (3¼” x 10”) rectangular duct.If a round duct is required, a rectangular-to-roundtransition adaptor must be used. Do not use less than a15.2 cm (6”) diameter duct.Maximum duct length:For satisfactory air movement, the total duct length of8.3 x 25.4 cm (3¼” x 10”) rectangular or 15.2 cm (6”)diameter round duct should not exceed 42.7 m(140 feet).Elbows, transitions, wall and roof caps,etc., present additional resistance to airflow and areequivalent to a section of straight duct which is longerthan their actual physical size. When calculating the totalduct length, add the equivalent lengths of all transitionsand adaptors plus the length of all straight duct sections.The chart below shows you how to calculate totalequivalent ductwork length using the approximatemeters (feet) of equivalent length of some typical ducts.5Installation Instructions