"Closable" Ducted A/C Vents

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Hi All,

I have ducted A/C througout the house. The house is mostly a single level house with floor ducting, but the back of the house is double story and has a couple of rooms downstairs with one ceiling duct, which is a square diffuser type as per pic:
Attachment 76884 (http://www.renovateforum.com/attachments/f78/76884-closable-ducted-c-vents-duct.jpg)

I would like to shut this vent off completely on occasions so is one of those circular diffusers a good idea? I think they rotate and close off completely?
Attachment 76885 (http://www.renovateforum.com/attachments/f78/76885-closable-ducted-c-vents-roundceilingdiff.jpg)

Am guessing the hole in the ceiling is round so the circular diffuser should fit.

Would think it would simply mean more air elsewhere, but would doing this cause any dramas??

I am having zoning issues like some of the other threads I have read, but I thought this would be a quick interim solution until I get around to sorting out the zone motors.

Cheers

Attached Images http://www.renovateforum.com/attachments/f78/76884d1257406747-closable-ducted-c-vents-duct.jpg http://www.renovateforum.com/attachments/f78/76885d1257406809-closable-ducted-c-vents-roundceilingdiff.jpg



Read the full thread at RenovateForum.com... (http://www.renovateforum.com/f78/closable-ducted-c-vents-78444/)