MODEL OBD-106 OPPOSED BLADE DAMPER - NCA Manufacturing

MODEL OBD-106OPPOSED BLADE DAMPERStandard Construction:Frame:Blades:Bearings:Axles:Linkage:Linkage Tie Rod:Operator Shaft:Finish:Minimum Damper Size:Maximum Damper Size:Options:Seals:Operators:Finish:Face & Bypass:Notes:3-1/2" x 5/8" (88.9 mm x 15.9 mm) x 16 gauge rollformedgalvanized steel hat section with welded corners.16 ga. rollformed galvanized steel on 6" (152.4 mm) centers.Permanently lubricated oilite bronze, press fit into frame.1/2” dia. (12.7 mm) plated steel.Commercial grade, brass pivots, machine riveted to blade.1/4" dia. (6.4 mm) plated steel.6" x 1/2" dia. (152 mm x 12.7 mm) plated steel.Mill galvanized.6"w x 12"h (152 mm x 304.8 mm)Single Section: 48"w x 72"h (1,219 mm x 1,828 mm)Multi Section: unlimitedVinyl or stainless steel blade sealsFlexible stainless steel jamb sealsMotor mounting - factory furnished or by othersManual quadrantPainted finishesRight angle and straight line mixing dampers• All dampers are fabricated 1/4" under listed sizes unlessspecified "actual or exact".• Dampers must be installed square and free from racking.• Dampers with multiple sections in both width and heightrequire structural supports (by others). NCA recommendsthat large openings be divided with structural memberssuch that dampers will span either the width or height ofeach opening between the structural memberswith a single section.• All dampers must be installed with blades runninghorizontally.• Connect all damper motors to linkage side of operatorblade or to operator shaft.• Consult factory if application involves static pressuresin excess of 2.5 inches w.g.6"(152 mm)3-1/2"(88.9 mm)OBD-106 - 03-0511" min.(279.4 mm)clearanceMULLIONJAMBSpecifications are correct at time of printing. However, as part of our ‘continuous improvement program,’ we reserve the right to make further improvements without notice.© 1999 NCA ManufacturingProject:Location:Architect:Contractor:Address:P.O. Number:Engineer:NCA MANUFACTURING, INC. 1036 SOUTH JUPITER ROAD GARLAND, TEXAS 75042 TEL. 972-276-5002 FAX 972-276-6747Date:

MODEL OBD-106OPPOSED BLADE DAMPER1.0 .9.8.7.6.5.4.3.25.2.15.1.09.08.07.06.05DAMPER SIZE 24 x 24DAMPER SIZE 12 X 12© 1999 NCA ManufacturingPressure drop testing was conducted by an independent laboratory in accordance with the AMCA Standard 500-D, Fig. 5.3ductwork upstream & downstreamPRESSURE DROP - INCHES OF WATER (In. W.C.)2.521.5.04.03.025.02.015DAMPER SIZE 36 x 36PRESSURE DROPOBD-106 - 03-05.01100 150 200 300 400 500 700 900 1500 2000 3000 4000 60001000VELOCITY THROUGH FACE AREAPressure (In. W.G.)54321PRESSURE LIMITATIONS00 12 24 36 48Section Width (In.)Leakage Performance test wasconducted by an independentlaboratory in accordance with AMCAStandard 500-D and is expressed asCFM/SQ. FT. of damper face area.Damper requires both blade edgeseals and jamb seals to achieveleakage performance depicted.VELOCITY THROUGH FACE AREAPressure & VelocityLimitations presented inthe adjoining graphs areconservative in order toavoid mis-applications.Please contact factory forapplication guidance ifyour requirements exceedpublished limitations.STATIC PRESSURE1098765432.521.51.0Velocity (FPM)3000250020001500VELOCITY THROUGH FACE AREAVELOCITY LIMITATIONS10000 12 24 36 48LEAKAGEDAMPER SIZE 36 x 48Section Width (In.)1 1.5 2 3 4 5 7 9 15 20 30 40 6010LEAKAGE IN CFM/SQ. FT.NCA MANUFACTURING, INC. 1036 SOUTH JUPITER ROAD GARLAND, TEXAS 75042 TEL. 972-276-5002 FAX 972-276-6747