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Old 07-12-2022, 11:07 AM   #1
JDG
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Third Intake Added for AC

I added a third intake grill for the AC as I felt the two small intakes were very restrictive on the air flow. Noticeable outflow improvement. Click image for larger version

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Old 07-12-2022, 11:19 AM   #2
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Originally Posted by JDG View Post
I added a third intake grill for the AC as I felt the two small intakes were very restrictive on the air flow. Noticeable outflow improvement. Attachment 419306
What did you use for the grills/vents?

How did you cut the aluminum sheets ?

Thanks in advance.
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Old 07-12-2022, 11:37 AM   #3
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I replaced my outflow vents with a less restrictive vent I got off Amazon. Made a template for the correct size opening and used an air nibbler to cut out the inlet. Reinforced the strips in between the vents with 1/2 inch aluminum angle riveted in place to stiffen the narrow pieces. Purchase two grills (what you see in the pic) from Woodland Airstream in Michigan. Not sure how much it increased but you can feel a much stronger outflow and all three intakes are sucking air. I covered each intake up one at a time with a piece of paper and all are equal. Happy with the results.
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Old 07-12-2022, 11:38 AM   #4
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Click image for larger version

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ID:	419307Click image for larger version

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Before and after the cut.
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Old 07-12-2022, 11:58 AM   #5
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Originally Posted by JDG View Post
Attachment 419307Attachment 419308

Before and after the cut.
Thanks for the additional info. Would you mind sharing the links to the amazon outlet vents?

Do you have a part number for the inlet vents?
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Old 07-12-2022, 12:07 PM   #6
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Sure,airstream part 382341 (about $47). The Amazon is in the picture. I removed the screen that came in them. Click image for larger version

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Old 07-12-2022, 04:53 PM   #7
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Sure,airstream part 382341 (about $47). The Amazon is in the picture. I removed the screen that came in them. Attachment 419314
Gracias Amigo!
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Old 07-13-2022, 09:57 AM   #8
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A question. So you did not have to add any additional piping/vent in the ceiling? You added the 2 vent facia to the open ribbing to the sides of the original vent and that area was available for the extra vents?
Thanks
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Old 07-13-2022, 01:49 PM   #9
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Quote:
Originally Posted by JDG View Post
I added a third intake grill for the AC as I felt the two small intakes were very restrictive on the air flow. Noticeable outflow improvement. Attachment 419306
Very nice job, this is going to go on my todo list.
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Old 07-13-2022, 04:12 PM   #10
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Davetoregon
I added a grill in the center of the two existing intakes which airstream uses. There is enough room between them to add the third grill in the middle. Reinforced the two strips in the middle section with 1/2 aluminum angle riveted in place at both ends. Stronger than before the mod.
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Old 07-16-2022, 05:31 PM   #11
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Thanks for posting this. I have been trying to figure out the best way to enlarge the return air on my 23'FC. I ordered a grill from Woodland Airstream and it should be here next week.
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Old 07-16-2022, 07:57 PM   #12
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Nice job! Why not a single larger one that would hold a standard throw away filter? I think the one on my basement intakes are like 10” x 10”. Another project I need to look into. It would really be nice just to have a good commercially available HVAC filter to use instead of the Airstream cleanable ones. I also want to replace the stupid adjustable directional output vents. Two are already jammed.
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Old 07-16-2022, 08:43 PM   #13
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I wanted to put an HVAC filter on my house and the a/c people said it would put too much restriction on the return air. . I added another filter to the system. I've wondered if it would do the same thing to my AS. On my AS one of my output vents was jammed by the rivet that holds it to the ceiling. I unjammed it with a screwdriver.
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Old 07-17-2022, 08:10 AM   #14
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Hi Question Of course I Might be wrong?
But here’s my question. In my home if I turn up fan speed
Thinking to cool off faster. The air seems to come out of the registers warmer so I just leave it on slow fan speed and there seems very cold coming out of the registers. So I will have to get my laser thermometer out and test this?
Just a question? Maybe HVAC guy will let me know.
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Old 07-20-2022, 09:54 AM   #15
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Air conditioned air is colder and denser. The fan should be on high to move the colder dense air. You will not mind having the extra breeze. In the heating mode slower the fan down to avoid the drafts.
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Old 07-20-2022, 10:56 AM   #16
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Air conditioned air is colder and denser. The fan should be on high to move the colder dense air. You will not mind having the extra breeze. In the heating mode slower the fan down to avoid the drafts.
That's what the A/C guy told me when I asked him if I could run the fan at a lower speed.
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Old 07-20-2022, 02:23 PM   #17
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What a great idea! I have previously exchanged the ceiling vents and I thought I'd see if I could measure the difference of airflow with and without the air return grills/filters in place.


My results are attached, looks like an improvement as mentioned by the OP. Additional grill on order. We have a 25' FC FBT single AC.


Steve
Attached Thumbnails
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Old 07-20-2022, 02:28 PM   #18
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Originally Posted by TitusNW View Post
What a great idea! I have previously exchanged the ceiling vents and I thought I'd see if I could measure the difference of airflow with and without the air return grills/filters in place.


My results are attached, looks like an improvement as mentioned by the OP. Additional grill on order. We have a 25' FC FBT single AC.


Steve
Any idea how much of a difference in airflow changing out the outlet registers might have made in terms of measured values?
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Old 07-20-2022, 03:21 PM   #19
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The pictures of airflow (mph) at each vent are attached to my post. Click on them and they'll be big enough to read



Steve
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Old 07-20-2022, 05:09 PM   #20
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The pictures of airflow (mph) at each vent are attached to my post. Click on them and they'll be big enough to read



Steve
Hi Steve, I was interested in the data for your older modification of the outlet registers. This would pre-date the discussion regarding improving the air return flow rate.
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