Not really. It looks like the registers are double defection, which means each blade and be individually adjusted. You could close off half of the back blades. It will increase noise but at least it will reduce airflow.
Originally Posted by Freeagent
If a nation expects to be ignorant and free, in a state of civilization, it expects what will never be. (Thomas Jefferson 1816)
Thanks for the input. I am an engineer and tend to over-analyse everything and not guess. But in the case of the registers had to just choose between only two 12x6 residential type registers I could source.
Originally Posted by skippedover
The house is existing and was designed for a 2.5ton A/C. Duct sizes vary to different rooms and some rooms have dual registers. HVAC-Calc says duct sizes are OK for exposure. I also ran a duct loss calc to ensure velocities were OK through system and that air handler would be happy. Contractor double checked and agreed.
Original registers were stamped multishutter type and could be balanced to make A/C work OK. Some needed replacement, so we went with same size but type with individual vane adjustment to better direct air. We could have got exact replacements from Lowes but chose the Dayus instead.
The new registers have more open area which may reduce noise, but may reduce throw. We will see. (not many choices available in 12x6 size and we were not going to change boots and repair ceiling when existing size had worked for 40+ years).
Thanks - Good to know. I have not had them in my hands yet, so don't know how far the vanes can be moved.
Originally Posted by Gib's Son
Tried to look at your pictures of grilles but was bumped out with a message saying that I don't have the privilege yet, go figure.
I agree though with one of the posts in that the boots that hold the older grilles may not have the depth to accommodate the replacement grilles and this needs to be considered. efficiency aside I also hate the look of standard grilles there are grilles that are less offensive but can get pricey. I just did a google image search on architectural grilles and there are many to choose from.
Another thought is if you change the efficiency of the grilles you can disrupt the air flow balance and this may require balancing for adequate heating and cooling distribution. My two cents.