48" Plenum Box for [48" Linear Slot Diffuser - (3 Slot) Triple Slot] Premium Insulated Plenum Box for Heating and Cooling - Texas Buildmart
48" Plenum Box for [48" Linear Slot Diffuser - (3 Slot) Triple Slot] Premium Insulated Plenum Box for Heating and Cooling - Texas Buildmart
Linear Slot Diffusers

48" Plenum Box for [48" Linear Slot Diffuser - (3 Slot) Triple Slot] Premium Insulated Plenum Box for Heating and Cooling - Texas Buildmart

Regular price $189.99 Sale price $249.99 Unit price per
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  • Galvanized sheet metal Plenum Box with black foam insulation, ideal for Texas Buildmart 48" lineal slot diffuser. This air-distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air. Connects to: 10" flexible duct in oval shape. Can be used and brazed to a 4" or 6" wood stud. If you do not have this size flex, you can use a reducer to modify the size. Professional HVAC Installer is Recommended.
  • Ideal for Texas Buildmart 48" Lineal Slot Diffuser - 3 Slot
  • Galvanized sheet metal Plenum Box with foam insulation
  • Total Box Dimensions: L: 48 3/4" W: 6 1/16" H: 11 15/16"
  • Mouth Dimensions: L: 47 1/2" W: 4 7/8"
  • Entry size: 2 entries of 10" flex in oval shape
  • This air-distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air
  • If you do not have this size flex, you can use a reducer to modify the size
  • We recommend using a "Y" shaped splitter to supply your plenum box with an even amount of airflow through your diffuser. 

48" 3 slot linear diffuser

Here's a link to the Diffuser that fits this Plenum Box:

48" Linear Slot Diffuser - 3 Slot - Triple Slot Linear Diffuser - Texas Buildmart - Modern AC Vent Covers for Ceilings, Walls & Floors - Commercial Grade HVAC Registers, Grilles & Vents - Home Decor & Wall Decor for Amazon Home

Frequently Asked Questions 

If you have any questions, feel free to check our Contact Us page or Call Us at (956)900-1103 and/or email us at: sales@texasbuildmart.com 

What's the Difference between a Modern AC Vent Cover and a Linear Slot Diffuser?

 Modern AC Vent Covers vs Linear Slot Diffusers

What does a Linear Slot Diffuser do? What are Linear Slot Diffusers used for? What is a Slot Diffuser? What is a Linear Diffuser? What is a Linear Vent? 

Linear Slot Diffusers are Vent Covers that are Linear and the “face” of a vent. The Air Conditioning unit distributes air throughout the home/building via the air duct tubing and delivers hot/cold air to each room that the vent is in, through the face of the vent, which is the Air Vent Cover or Linear Slot Diffuser. 

Are Linear Slot Diffusers good? 

Linear Slot Diffusers are the “face” of the vent, often referred to as a Vent Cover. Linear Slot Diffusers are good in the sense that they are aesthetically pleasing to look at and give a modern feel to any room they are in.  

How do I choose a Linear Slot Diffuser? 

For New Builds, we always recommend checking with your HVAC Contractor to confirm the CFM’s each room will need and then selecting you your Linear Slot Diffusers based on the CFM’s we have listed on our Brochures in the Links below the image. If it’s a remodel and you want to go from an Old Vent Cover to a Linear Slot Diffuser, we recommend going based on the CFM’s we have listed on our Brochures in the links below the image. First, remove your Old Vent Cover, measure the hole, and based on those measurements, find the size on the “Standard Linear Slot Diffuser” link, and then compare it to the “Linear Slot Diffusers” link just as is shown in the image below, you want to be as close as possible with the CFM’s. 

Standard Linear Slot Diffusers:  

https://www.linearslotdiffusers.com/pages/standard-linear-slot-diffusers 

Linear Slot Diffusers:  

https://www.linearslotdiffusers.com/pages/linear-slot-diffusers-and-plenum-box 

What sizes do vent covers come in? What is the standard vent cover size? 

Vent Covers, Grilles, Registers, Diffusers come in different sizes. The most Standard Sizes being 10” x 6” and 12” x 6” and 8” x 4” - You will find at least one of these in most homes. Standard Sized air vent covers can range from 6” x 4” all the way to 30” x 24” (which are all sizes we carry). 

How do you measure vent covers? How do you measure vent replacement covers?  

We recommend measuring the size of the air duct opening to make sure the AC Vent Cover neck will fit into the opening. Our product dimensions are categorized by the neck of the AC Vent Cover and not by the face of the AC Vent Cover. Below is a quick flyer of what to measure for on an AC Vent Cover after removing it. 

How to measure and install modern ac vent covers

What do I need to know to purchase one of your Diffusers?  

To purchase one of our diffusers, all you need is to: 

  1. Unscrew your Old Vent Cover 
  2. Remove Old Vent Cover 
  3. Measure duct (open hole) with a measuring tape 
  4. Then based on those measurements you can order a Diffuser from our website: www.LinearSlotDiffusers.com 

How do I choose a Linear Slot Diffuser? 

First, we’d recommend finding out the CFM’s that the room the Linear Slot Diffusers will be in, and if using multiple Linear Slot Diffusers, then subtracting the CFM’s according to how many Linear Slot Diffusers the room will have. 

Second, we recommend selecting the style, will it be a single slot, double slot, or triple slot Linear Slot Diffuser. While Single Slots look nice and thin, they don’t have the same CFM output that the larger 2 Slot and 3 Slot Diffusers do. 

Third, ordering the Linear Slot Diffusers and installing it (we recommend having a professional installing it, but you can do it yourself). 

Check out our catalogues to see which Vent Cover neck and face sizes would fit your duct opening:  

Standard Linear Slot Diffusers: https://www.linearslotdiffusers.com/pages/standard-linear-slot-diffusers 

Linear Slot Diffusers: https://www.linearslotdiffusers.com/pages/linear-slot-diffusers-and-plenum-box 

What is the difference between an AC Vent Cover and a Linear Slot Diffuser? What is the difference between Grille and Diffuser? What is the cover of a vent called? 

There is no difference between Vents, Diffusers, Registers, Grilles. They are all just different names used by different industries for AC Vent Covers. AC Vent Covers are the "Face" of your AC Ducts which is the inside of the black box you see when you remove your AC Vent Covers. AC Vent Covers' main two functions are to cover the duct and direct the airflow as it enters the room. 

How to install a Modern AC Vent Cover? 

The method of installation is through the pre-drilled holes inside of the diffuser. Once the vent is in place, you will find them by opening the dampers (restricting the air temporarily). We recommend a drill with an extension to install the metal perforating screws that will be included in the vent. You will receive the Linear Slot Diffuser in the OPEN position. The black blades will be touching each other and is in the fully open position. The airflow will go through the sides. When you separate the black blades, you will be restricting the airflow. You can do that manually with your fingers, then you will see the predrill holes and with a drill and an extension, you will screw the 4 metal perforating screws through the sides. To bring it back to an OPEN position, like any other Linear Slot Diffuser you will need a tool, like a flat plastic spatula, knife, anything that is flat and rigid. You will need to insert the tool between the black blade and the white face of the diffuser and pressure it towards back to the center. 

Here is a quick video demonstration: https://youtu.be/p6wwj-20tzE 

What does CFM stand for? 

CFM stands for Cubic Feet per Minute and is the most common way to measure airflow. We measure CFM assuming an Effective Velocity of 9.8 ft/s because it is the industry standard. Areas are measured in square units (like square feet), and Volumes are measured in cubic units (like cubic feet). Rooms are measured in Cubic feet and a room by industry standards should be cooled in under 4 minutes, so a single vent to a 1000 cubic foot room (10ft x 10ft x 10ft) should have at least one vent with a rating of at least 260 CFM or higher. However, we always recommend speaking with an HVAC expert or licensed professional first. 

How much CFM for each Linear Slot Diffuser AC Vent? 

To find the CFM rating of our Linear Slot Diffusers, you can find it by looking at the CFM column on our catalog links below (and which are displayed in the picture below: 

Standard Linear Slot Diffusers:  https://www.linearslotdiffusers.com/pages/standard-linear-slot-diffusers 

Linear Slot Diffusers: https://www.linearslotdiffusers.com/pages/linear-slot-diffusers-and-plenum-box 

Do your Linear Slot Diffuser AC Vents come in different colors? 

At the moment, we only offer our AC Vent Covers in standard ceiling white. We are able to keep our Modern AC Vent Covers reasonably priced is because we manufacture our Vent Covers in bulk, which is why we only offer our Vent Covers in standard ceiling white and which is why we don't do custom sizes. 

Are your Linear Slot Diffuser AC Vents paintable? 

Yes, while we only offer our AC Vent Covers in standard ceiling white, our vent covers are paintable. We don't suggest painting the vent covers because they are powder coated with an electrostatic paint which makes them easy to clean and very dust resistant. However, if you do choose to paint our vent covers, we recommend using an oil-based paint or epoxy. 

Does it require a licensed installer, or can I install the Modern AC Vent Cover myself? 

No, it is not required. We recommend you look up your county and state guidelines to see if a permit is required for remodeling HVAC systems. We designed our Linear Slot Diffusers to be installed by the average homeowner because we believe in convenience. That is why we recommend watching our videos and looking up information online and/or seeking the console of a handyman or HVAC installer. 

Here is a video demonstration: https://youtu.be/p6wwj-20tzE 

Do you offer custom-sized Linear Slot Diffuser AC Vents? 

At the moment, we unfortunately do not offer custom-sized Linear Slot Diffusers. To keep our AC Vent Covers at the highest quality and remain at an affordable price, we manufacture our models at scale - meaning we manufacture in bulk. That is another reason why we are always in stock and ready to ship. 

How do your Linear Slot Diffuser AC Vents work? 

Our Linear Slot Diffusers offer a Directional System with a 3-Way Air Flow Option that can be achieved by changing the direction of the dampers (louvers) by adjusting them with a plastic putty knife or tool with a flat surface. The Inner Mounting Installation Function and Design Avoids Exposing the Duct. The Electrostatic Paint offers a Smooth Finish which makes them Easy to Clean 

Can your Linear Slot Diffuser AC Vents be installed on the floor? 

Yes. Our Vent Covers were initially designed to be only for ceilings but after changes in design we have adjusted our designs so that they can be easily installed on Ceilings, Walls and Floors. If it fits, it sits - meaning if the duct opening is a 12x4 opening then it doesn't matter if it's on the ceiling, wall or floor, our AC Vent Cover can be installed. 

Are your Linear Slot Diffuser AC Vents directional or can the airflow be adjusted? 

Our Standard Linear Slot Diffusers offer a 90-degree directional airflow. Our Linear Slot Diffusers offer a 180-degree directional airflow. This directional airflow can be achieved by changing the direction of the dampers (louvers) by adjusting them with a plastic putty knife or tool with a flat surface.  

Do your Linear Slot Diffusers/Modern AC Vent Covers work as a return? 

Yes, all our models can be used to serve as both a supply and as a return AC Vent. However, keep in mind that when being used as a Return vent, we recommend using a 0.8x multiplier on the listed CFM (i.e., listed CFM of 300 would be for the supply and that same vent cover if used as a return vent cover would have the CFM of 240) because it is harder to suck in air than it is to push the same amount of air. 

How do your Linear Slot Diffusers/Modern AC Vent Covers compare to a normal AC Vent? 

  • Provides a Contemporary Look, giving any room a more updated feel. 
  • Electrostatic Paint for a Smooth Finish makes our vents Easy to Clean. 
  • 100% Aluminum - No Corrosion - Very Sturdy and Resistant to Rust. 
  • Directional Dampers that not only diffuses the air but also adjusts the flow of air. 
  • Screws in from the side rather than the front which makes a more secure hold and gives it that fixture look. 

Do you sale Plenum Boxes? 

Yes, at the moment we only offer Plenum Boxes for our Linear Slot Diffusers (Linear Slot Diffusers - 1 Slot, Linear Slot Diffusers - 2 Slot, Linear Slot Diffusers - 3 Slot). We do NOT sell plenum boxes for our standard linear slot diffusers because usually when doing a retrofit, your will already have a plenum box. 

Do I need a Plenum Box for your Linear Slot Diffusers AC Vents? 

Yes, at the moment we only offer Plenum Boxes for our Linear Slot Diffusers: 

Linear Slot Diffusers - 1 Slot 

Linear Slot Diffusers - 2 Slot 

Linear Slot Diffusers - 3 Slot 

They are made of galvanized metal and insulated with a black foam for a superior R rating that is higher than anything in the market. 

Do you sale Plenum Reducers? 

No, we don't carry or sale Plenum Reducers. A Plenum Reducer is like a coupling between a larger Plenum connection to a smaller ac connection. You can purchase plenum reducers at your local Home Depot or Lowes. They aren't too expensive, and most associates will know what you are talking about. 

Do Linear Slot Diffusers/Modern AC Vent Covers fit with an existing Air Duct? 

Yes. Our Linear Slot Diffusers/Modern AC Vent Covers were designed to be the quickest and easiest way to replace your current AC Vent Covers. You can do it yourself or have a handyman do it for you. Replacing your vents with Linear Slot Diffusers/Modern AC Vent Covers is the more cost-effective option as well. 

As stated above, we recommend measuring the size of the air duct opening to make sure the AC Vent Cover neck will fit into the opening. Our product dimensions are categorized by the neck of the AC Vent Cover and not by the face of the AC Vent Cover. Below is a quick flyer of what to measure for on an AC Vent Cover after removing it. 

Do you offer estimates for large orders? 

Yes, call us at (956) 900-1103 for more information  


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