Zone dampers Spring return (no) Spring return
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![iO HVAC Controls HD-2816-BM Rectangular 28 x 16 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_46fe4712-8c4a-4c9b-9b05-a020ec0be55d_medium.jpg?v=1719992176)
HD-2816-BM | Rectangular 28 x 16 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2816-BM
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![iO HVAC Controls HD-2212 Rectangular 22 x 12 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_908b3d4c-9afb-43ae-ac13-9737bc4a4e59_medium.jpg?v=1719992176)
HD-2212 | Rectangular 22 x 12 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2212
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![iO HVAC Controls HD-3410-BM Rectangular 34 x 10 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_02c96a3d-fc3d-4861-9a12-d782325a43da_medium.jpg?v=1719992176)
HD-3410-BM | Rectangular 34 x 10 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-3410-BM
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![iO HVAC Controls HD-2616 Rectangular 26 x 16 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_2ab4f74d-eaed-44b8-84d3-67eab7394c97_medium.jpg?v=1719992176)
HD-2616 | Rectangular 26 x 16 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2616
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![iO HVAC Controls HD-2624 Rectangular 26 x 20 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_86799706-6979-4412-a8fd-b9d2dc9c7447_medium.jpg?v=1719992176)
HD-2624 | Rectangular 26 x 20 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2624
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![iO HVAC Controls HD-1610 Rectangular 16 x 10 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_ac2a612f-893b-4a69-8e30-0deca913f8ba_medium.jpg?v=1719992171)
HD-1610 | Rectangular 16 x 10 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-1610
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![iO HVAC Controls HD-2608-BM Rectangular 26 x 08 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_d4c0e9ad-804e-4ef1-81ce-abbaee0992b5_medium.jpg?v=1719992171)
HD-2608-BM | Rectangular 26 x 08 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2608-BM
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![iO HVAC Controls HD-3020-BM Rectangular 30 x 20 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_7dbe75ea-e76d-40c7-a751-604d115d5af3_medium.jpg?v=1719992166)
HD-3020-BM | Rectangular 30 x 20 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-3020-BM
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![iO HVAC Controls HD-1614-BM Rectangular 16 x 14 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_8e904a12-08c2-48fe-8c0b-512db486f58c_medium.jpg?v=1719992165)
HD-1614-BM | Rectangular 16 x 14 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-1614-BM
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![iO HVAC Controls HD-1406-BM Rectangular 14 x 06 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_a898b8c4-4322-4de4-8ede-858218573b39_medium.jpg?v=1719992166)
HD-1406-BM | Rectangular 14 x 06 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-1406-BM
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![iO HVAC Controls HD-2418-BM Rectangular 24 x 18 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_2daf8079-e63e-4b31-9964-6337c629e205_medium.jpg?v=1719992165)
HD-2418-BM | Rectangular 24 x 18 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2418-BM
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![iO HVAC Controls HD-2008 Rectangular 20 x 08 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_16c65d7c-a4da-4f39-9e6a-51e2a11202d5_medium.jpg?v=1719992166)
HD-2008 | Rectangular 20 x 08 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2008
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![iO HVAC Controls HD-1806-BM Rectangular 18 x 06 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_83380970-1a60-4f47-be9a-cf8600ea0444_medium.jpg?v=1719992165)
HD-1806-BM | Rectangular 18 x 06 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-1806-BM
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![iO HVAC Controls HD-2208 Rectangular 22 x 08 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_c5f4c53b-3ad4-4755-b087-36f541af5173_medium.jpg?v=1719992165)
HD-2208 | Rectangular 22 x 08 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2208
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![iO HVAC Controls HD-3212 Rectangular 32 x 12 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_bc756b6d-1983-433c-b19a-923691592d55_medium.jpg?v=1719992161)
HD-3212 | Rectangular 32 x 12 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-3212
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![iO HVAC Controls HD-3012-BM Rectangular 30 x 12 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_ed311038-65b1-4c0d-b002-dec09f0d6bbd_medium.jpg?v=1719992160)
HD-3012-BM | Rectangular 30 x 12 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-3012-BM
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![iO HVAC Controls HD-1814 Rectangular 18 x 14 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_65697c22-240f-4760-91c5-282fd6c6dd2a_medium.jpg?v=1719992160)
HD-1814 | Rectangular 18 x 14 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-1814
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![iO HVAC Controls HD-2420 Rectangular 24 x 20 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_4363cb8e-3197-4d5c-9c9c-401ab4e15ed6_medium.jpg?v=1719992166)
HD-2420 | Rectangular 24 x 20 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2420
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![iO HVAC Controls HD-2612-BM Rectangular 26 x 12 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_370b4314-5975-4972-a213-70bf3e2f11c1_medium.jpg?v=1719992156)
HD-2612-BM | Rectangular 26 x 12 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2612-BM
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![iO HVAC Controls HD-2822 Rectangular 28 x 22 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_e73685c3-2f5b-4c9e-ba50-761ec84d30e5_medium.jpg?v=1719992156)
HD-2822 | Rectangular 28 x 22 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2822
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![iO HVAC Controls HD-2008-BM Rectangular 20 x 08 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_df089880-a42e-4c75-808f-f6f9b115fd23_medium.jpg?v=1719992156)
HD-2008-BM | Rectangular 20 x 08 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2008-BM
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![iO HVAC Controls HD-2408-BM Rectangular 24 x 08 Zone Damper-BM | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_0136e88a-ce9b-45b1-95a9-dea1fa0cf63e_medium.jpg?v=1719992156)
HD-2408-BM | Rectangular 24 x 08 Zone Damper-BM | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-2408-BM
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![iO HVAC Controls HD-3408 Rectangular 34 x 08 Zone Damper | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/iO-HDXXXX_464fdf09-6fa4-4a29-8555-9a73f0474704_medium.jpg?v=1719992155)
HD-3408 | Rectangular 34 x 08 Zone Damper | iO HVAC Controls
Brand: iO HVAC Controls
SKU: HD-3408
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