How Do Obd Registers Work
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Supply Grilles with Opposed Blade Dampers for Air Balancing?
Due to the location of the supply plenum, my front guest b/r is too cold when the A/C is on, also hot when heated in wintertime, even though the adjustable supply grille is nigh all the way airtight. This room stays about half dozen degrees cooler/warmer than other rooms. Ducts have been inspected and they're all skillful, Infiltrometer menstruation hood/blower door testing has verified they're all skilful.
One contractor suggested a fixed damper at the plenum inside the duct leading to the front end bedroom. Another contractor suggested putting a smaller duct within the the existing duct at the supply grille as a "footstep-downwards" to reduce the airflow at the grille. Some other contractor suggested replacing the supply grille with 1 that has a screwdriver adaptable opposed blade damper (OBD). The OBD grilles are supposed to exist very cheap (less than $**.**) and easy to install.
Anyone have experience with the OBD grilles? Practice they piece of work well to solve minor air balancing issues? Or would ane of the other solutions be better?
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The opposed blade dampers on the back side of the supply registers work quite well, only can cause an increment in air dissonance if you take to close them very far to become the desired airflow.
An adjustable damper at the supply duct connection to the plenum too works very well, and is quieter.
I would non practice the "step-downwards" duct, as there would not be adjustable, and is probably more expensive than either of the other options.
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Concur with Marking, go with the mitt damper at supply plenum.
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http://world wide web.hartandcooley.com/grd/all_grd.htm
Sidewall / Ceiling Registers and Grilles
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Originally Posted by mark beiser 
The opposed blade dampers on the back side of the supply registers piece of work quite well, but can crusade an increase in air noise if you have to close them very far to get the desired airflow.
An adjustable damper at the supply duct connection to the plenum too works very well, and is quieter.
I would not practice the "step-down" duct, as in that location would not exist adjustable, and is probably more than expensive than either of the other options.
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X4
ask installer to mark on duct or plenum open and airtight positions
of damper to brand it easier for you to arrange as needed.
brand certain they mastic seal afterward damper is installed.all-time of luck.
The cure of the part should not be attempted without the cure of the whole. ~Plato
- If it needs to be adjusted, it needs to be at the grill. There is no way I'll ever be able to climb the pulldown stairs to the attic and clamber across the fiberglass insulation to observe a damper lever at the plenum. I went on Medicare today and someday soon I'll be really sometime! Lol Originally Posted by energy_rater_La
X4
enquire installer to mark on duct or plenum open and closed positions
of damper to make information technology easier for you to adjust equally needed.
make sure they mastic seal later on damper is installed.all-time of luck.
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you lot could also enquire the contractor if he could install a perforated screen ahead of the opposed blade dampers as this will both reduce airflow and tranquility the air dissonance
Originally Posted by mark beiser The opposed blade dampers on the dorsum side of the supply registers work quite well, simply can cause an increase in air noise if you have to close them very far to get the desired airflow.
An adjustable damper at the supply duct connexion to the plenum also works very well, and is quieter.
I would not do the "step-downwardly" duct, as there would not be adjustable, and is probably more expensive than either of the other options.
- Thanks! I haven't tried to find the opposed blade damper locally yet, only if I can't, I was considering fashioning a diffuser of sorts out of plastic and attaching information technology to the back of the existing supply grill. I may try that next week anyway, simply for kicks! Originally Posted by superfittertech
yous could too inquire the contractor if he could install a perforated screen ahead of the opposed blade dampers as this volition both reduce airflow and serenity the air noise
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The damper at the supply plenum as other have suggested is the way to go since you e'er take besides much airflow into that room. We have i for our principal sleeping accommodation, just since nosotros always wan it libation in there I accept to go in the cranium twice a year to move the damper. 'redneck zone control' if y'all will..
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you don't want to use plastic. during winter heat is fairly hot comming out of ducts.
as plastics warm they off gas.putting the damper at the plenum will redistribute the air thoughout the other
ducts. shutting off the air flow at the supply grill doesn't.
transmission damper could be gear up at time of install, with you lot downstairs
controlling how much or how little, and installer in cranium following
your directions.best of luck.
Final edited by energy_rater_La; 09-03-2012 at 09:04 AM. Reason: sp
The cure of the part should not be attempted without the cure of the whole. ~Plato
- Got information technology! I was thinking the type of "plastic" used for ducting dryer vents, and so high estrus wouldn't be an issue. Originally Posted by energy_rater_La
you don't want to apply plastic. during wintertime rut is fairly hot comming out of ducts.
equally plastics warm they off gas.all-time of luck.
- With gas estrus the white plastic will "yellow" over time. Registers is something I don't go cheap on. The commercial grade registers with the fully adjustable vanes are well worth the extra cost IMHO. Hart & Cooley 821 Originally Posted past Florida Joy
Got it! I was thinking the type of "plastic" used for ducting dryer vents, so loftier oestrus wouldn't be an event.
- Yellowing is not a problem. I don't have gas oestrus and rarely even turn the oestrus pump to "estrus". Originally Posted past 54regcab
With gas rut the white plastic volition "yellow" over time. Registers is something I don't go cheap on. The commercial grade registers with the fully adjustable vanes are well worth the actress cost IMHO. Hart & Cooley 821
There's a local Johnstone Supply not far from me, so later Labor Day I'll bank check to see if they'll sell directly to me. I'one thousand told they also carry the Honewell fc40r 5" filters I've been looking for to supplant the 1" filters in my return grille.
- Even if Johnstone won't, at that place are probably local supply houses that volition. The 821 series is a common stock item unless your house has odd register sizes. It's surprising how much existence able to accommodate the direction/velocity of the registers tin can contribute to condolement. Until yous have used a practiced annals you don't know what you are missing. Originally Posted by Florida Joy
Yellowing is not a trouble. I don't accept gas estrus and rarely even plow the heat pump to "heat".
At that place'south a local Johnstone Supply non far from me, and then after Labor 24-hour interval I'll cheque to see if they'll sell directly to me. I'm told they also carry the Honewell fc40r 5" filters I've been looking for to supervene upon the 1" filters in my return grille.
- Originally Posted by Florida Joy
In that location's a local Johnstone Supply not far from me, then afterward Labor Day I'll check to see if they'll sell directly to me. I'm told they also carry the Honewell fc40r v" filters I've been looking for to supervene upon the i" filters in my return grille.
Went to Johnstone and "dropped" the proper noun of the HVAC owner who referred me. They're wholesale just, but since the manager knew the guy he agreed to sell to me, providing I'd smack him the next time I saw him! Originally Posted by 54regcab Fifty-fifty if Johnstone won't, in that location are probably local supply houses that will. The 821 series is a mutual stock item unless your firm has odd annals sizes. Information technology'south surprising how much existence able to adjust the management/velocity of the registers tin contribute to comfort. Until you have used a good register yous don't know what you lot are missing.
Picked up 2 of the A611MS curved bract supply registers and a Honeywell fc40r filter. What a difference! With the new registers adjusted, the temperature differential between the coldest (front bedroom) and warmest (back corner "add-on" office) is only one or 2 degrees, depending on time of day. Other rooms (mbr, dining, kitchen, hall bathroom) already had the A611MS registers.... not sure why the previous owner didn't upgrade all at the same fourth dimension.
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Why practise you need to adjsut this damper? Information technology sounds like it massively over conditioned all year long. And then you should only add a damper virtually the first of the branch, or even only at the register boot, to reduce the airflow. I've never had any luck adjusting airflow at the grills unless veocity is very low already. I do accept two grills I arrange seasonally. They are supplies in my upstairs bathrooms. I cut them back a lilliputian in summer, then open them upwardly total in winter. But they are already counterbalanced with dampers in the attic for the proper corporeality of airflwo based on the size/heat loss of the room. OF course airflow in a bath vaires dramatically because there'southward no return and information technology has a frazzle fan. A fairly large 1 in our master bath.
- Front guest chamber (closest to the plenum) has e'er been 4 - 6 degrees cooler than main living area during summer. Not sure about winter, as we rarely apply heat. The simply person bothered by this cooler sleeping has been my girl-in-law. When grandkids sleep in that room, they dear information technology. When my girl and her boyfriend stay there, they love information technology. The old supply register wasn't able to reduce the airflow plenty to satisfy my girl-in-law, so I was looking for an alternative that would go on me out of the attic when adjustment was needed. The new supply register works corking correct now, merely if and when I really replace my equipment, I'll likely accept a "permanent" damper installed in that duct branch to rest the airflow a fiddling better. Originally Posted past motoguy128
Why do you need to adjsut this damper? Information technology sounds like it massively over conditioned all year long. SO you should simply add a damper near the outset of the branch, or even but at the register kicking, to reduce the airflow. I've never had any luck adjusting airflow at the grills unless veocity is very depression already.
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I wish more than of our customers understood the deviation skillful registers can brand.
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You but have i return in the whole house, right?
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How Do Obd Registers Work,
Source: https://hvac-talk.com/vbb/threads/1164891-Supply-Grilles-with-Opposed-Blade-Dampers-for-Air-Balancing
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