The hvac air devices and diffusers are very limited as far as the types the catalog has. I have tried to input different numbers for the different parts of the grille but it does not work. Can someone point me in the right direction to be able to input custom sizes and also find a broader selection of duct related equipment. I am also interested in groups that focus on HVAC, DUCT WORK, SHEET METAL APPLICATIONS, EQUIPMENT BLOCKS AND DESIGN. Thanks
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