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Each Doran Light Tight Darkroom Louver is designed to supply just the right amount of air to a particular model exhaust fan.
Note:
Exhaust fans work best in a darkroom equipped with fresh air supply louvers or some other kind of air supply. If there is no air supply to the darkroom the fan will be working against a vacuum and can do nothing.
Doran L-1212 Specs
Dimensions
13.75 x 13.75" (WxH) (outside grill) Cut out size is 12.25 x 12.25" (back of grill is 1.25" deep)
Packaging Info
Package Weight
2.7 lb
Box Dimensions (LxWxH)
14.5 x 14.25 x 2.85"
Doran L-1212 Reviews
Not entirely light tight
By George
Rated 4 out of 5
Date: 2026-04-03
Installed this as a fresh air intake in my darkroom. On its own its not entirely light tight (I'm assuming it would be if using with the fan that it's designed for which is no longer available. I was able to build a cover on the outside of the darkroom that lets air in thru the bottom, and it seems to have worked. Just be aware that you will need more than this vent to be turly light tight. Maybe building a box with one on each side would do the trick!
Great product
By Gary
Rated 5 out of 5
Date: 2024-07-12
I thought the product description said this size vent was metal, but it is plastic, which worked out fine. I sprayed painted the two vents white for the grow box I am building. This product will be excellent in helping me produce a light-proof environment inside the box. The vents are steady and well-made.
See any errors on this page?
Can this van be installed into a slanted ceiling?
Can this van be installed into a slanted ceiling?
Asked by: J
This is a Louver for A-1212 Fans, it is not the fan itself. Unfortunately we no longer have the A-1212 fan. If you are looking for a fan we have the Doran Pro-lab SL/WC Darkroom Exhaust Fan with Wall Cap as a special order item linked here. https://bhpho.to/3iWCUsa. This can be installed into a slanted ceiling, space permitting.
Answered by: Yaakov
Date published: 2021-01-29
question
What is the CFM rating of this vent?
Asked by: Jason B.
The Doran L-1212 Light Tight Darkroom Louver for A-1212 Fans is just a louver, so it would not have a CFM rating on its own. However, the A-1212 fans it's designed to be used with are 400 CFM.
Answered by: Kenneth C
Date published: 2025-07-06
can this fan be used at an angle? on a slanted ...
can this fan be used at an angle?
on a slanted roof for example.
Asked by: J
This louver can be mounted on a slanted roof if the A-1212 fan is mounted in the same manner.
Answered by: Kirk R
Date published: 2021-02-01
Does this have a regular 120v plug in? How many ...
Does this have a regular 120v plug in? How many watts does it use?
Asked by: J
This is just the louver. Think of it as being like a grille that blocks light. There is no fan. Rather, it goes with A-1212 fans.
Answered by: Yoni S
Date published: 2021-01-29
what are the dimensions of this vent?
what are the dimensions of this vent?
Asked by: brant
13.75 x 13.75" (WxH) (outside grill)
Cut out size is 12.25 x 12.25" (back of grill is 1.25" deep)
Answered by: Steve
Date published: 2026-06-10
Does this fan have regular 120v plug in? How many ...
Does this fan have regular 120v plug in? How many watts does it require?
Asked by: J
Doran L-1212 Light Tight Darkroom Louver for A-1212 Fans is not a fan, It is the cover for the discontinued Doran Light Tight Darkroom Exhaust Fan A-1212.
Answered by: Lawrence C
Date published: 2021-01-30
question
I have a question about the ventilation louver used for ventilationno fan with a fan and louver elsewhere in the room.Does the plain louver need a back cover for the other side of the wall?
Asked by: Anonymous
No. It works as you would expect. Cut the hole - screw in the vent. Done!
Answered by: Lee S.
Date published: 2020-01-12
question
If I install a louver in the door to the darkroom, is there a filter you can install over the louver to keep the dust out and if so, won't a filter compromise the air intake? The darkroom has an exhaust fan where the bathroom window used to be.
Asked by: Clayton Y.
In my application, Im moving ambient air thru a light tight black box of about 64 cubic feet. I have three of the darkroom louvers in the door. I push air into the box with a variable speed fan thru a HEPA filter. With the fan on its lowest setting, I needed three lovers to keep enough air exiting the box, so as not to blowup the box. Sorry, cant tell you the CFM of the fan, but as I mentioned, its variable speed and low speed is low. I mention this to point out that the louver itself blocks a fair amount of air flow. If youre trying to keep dust out, of an area, then your exhaust fan should never be turned off, and air entering the room should be filtered. If your exhaust fan is for fumes, then it needs to be on 24/7 or dirty air could re-enter thru the fan when its turned off, if the fan discharge does not have self or manual closing louvers (kind of like a dryer vent). If the exhaust fan is just for drawing heat out of the room (and you still want to control dust), then remove the fan seal as many room openings as possible and use two fans with HEPA filters (one for intake, the other for exhaust). Most HEPA filters by default are light tight, but will most likely cost more than the L-12152. Understand however that you will now be relying on the ambient air outside the dark room for heating and cooling, unless you have other provisions.
