Pemko #4301 Automatic Door Bottom, Aluminum Casing with Rubber Seals, .75" Drop
This heavy duty automatic door bottom has a drop-down seal which is lowered when the door is closed to prevent air, light, sound, fire, smoke, dust and moisture from infiltrating the gap under doors. Designed to be surface mounted or semi-mortised applied to the face of the door. Available in a choice of anodized finishes and choice of PemkoPrene™ or EPDM rubber seal.
Need it sooner? Stock sizes and finish are available to ship within 1-3 business days. See our: Pemko #4301CRL Automatic Door Bottom, Aluminum Casing with EPDM Rubber Seal .75" Drop - QuickShip
PRICED PER ITEM
How to Order: To determine size need see How to Measure for an Automatic Door Bottom. Can be cut an additional 2" in the field.
See tabs below for additional information
This heavy duty automatic door bottom has a drop-down seal which is lowered when the door is closed to prevent air, light, sound, fire, smoke, dust and moisture from infiltrating the gap under doors. Designed to be surface mounted or semi-mortised applied to the face of the door.
Need it sooner? Stock sizes and finish are available to ship within 1-3 business days. See our: Pemko #4301CRL Automatic Door Bottom, Aluminum Casing with EPDM Rubber Seal .75" Drop - QuickShip
EPDM vs. PemkoPrene Seal:
- When choosing a seal it is essential to determine the purpose for sealing and the floor surface beneath the seal. EPDM is comparable to Neoprene, though it is more Eco Friendly and has better performance in many areas. Specifically, it has great sound control properties and is solvent resistant.
- PemkoPrene has a multi-point compression design which works great on uneven surfaces such as a tiled floor or carpet. PemkoPrene is not a firm seal which allows for more leniencies. Both types of seals remain effective in a wide range of temperatures and can be used on external doors.
Installation: Installation instructions, end caps, and screws provided. This automatic door bottom can be surface mounted or semi-mortised applied to the face of the door.
Seal Replacement: Seals are manufactured to last through many usages, however if required, a replacement seal can be purchased, which eliminates the need to replace the whole door bottom. See our Pemko Automatic Door Bottom Replacement Seal.
Please note, images are for illustrative purposes only. They are not actual photos. Therefore, actual colors may vary slightly and size may be enlarged to show detail. See product specs for exact measurements.
This product has a 5 year guarantee against defects in material and workmanship.
Click here to view our full Warranty Policy.
To view another variation of this door bottom see our Automatic Door Bottom with Nylon Brush Seal.
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QuickShipNo
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ManufacturerPemko Manufacturing
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MPN4301PKL, 4301RL, OS4301PKL, OS4301RL
- Product Design
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Mounting TypeSurface Mounted, Semi-Mortised
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Door TypeWooden Door, Hollow Metal Door
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- Dimensions
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Casing DimensionsCasing measures .906" W x 1.781".
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LengthCustom Cut to Size
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Drop SizeUp to .75" Drop
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- Installation
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HandingNon-Handed
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Installation ScrewsInstallation Screws Provided
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SizingTo determine sizing required see 'How to Size an Automatic Door Bottom'
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- Special Features
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Compatible Insert Replacement#PK4304 PemkoPrene Replacement
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- Finishes
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FinishClear Anodized Aluminum (US28), Dark Bronze Anodized Aluminum (313), Flat Black (US19)
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- Compliance Details
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Compliance DetailsAir Infiltration Rated, Sound Rated, BHMA Certified, Smoke Rated, Fire Rated, UL Classified, GreenGuard Gold Certified
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ANSI DesignationR3G334, R3G344, R3G345
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Warranty5 Year Limited Warranty
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How It Works
The high quality automatic mechanism consists of an aluminum case which surrounds a moveable drop-bar seal. The drop-bar seal is actuated by a plunger which contacts the door jamb as the door is closing, forcing the drop-bar seal down against the floor / threshold. The plunger requires low "Feather Touch" closing force to actuate the drop-bar seal. The plunger causes the seal to always actuate on the hinge side first, which prevents the seal from skidding along the floor/threshold while the door is being closed. Door hang-up will not occur!
See also About Automatic Door Bottoms.
24" - 48" Length:
Click here for a Printable Copy of How to Install an Automatic Door Bottom.
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Automatic Door Bottoms are available with three mounting options: Surface Mounted, Semi-Mortised and Fully Mortised. A surface mounted application can be applied without removing the door from its hinges. For a semi-mortised, if the rabbet in the door is cut-out already, the door does not need to be removed. For a fully mortised application the door should be removed before starting. |
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STEP 1: SIZING YOUR DOOR BOTTOM Once your door is ready for installation you need to determine the size required for your door bottom:
For visual presentation see How to Measure for an Automatic Door Bottom. |
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Once you have determined the size needed, if necessary, trim your door bottom. Use a chop saw or table saw to create a perfectly straight cut. Note, Only trim opposite the actuating plunger, brass nut. (Trimming from the brass nut side will ruin your ADB).
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STEP 2: PREP FOR ATTACHING AUTOMATIC DOOR BOTTOM
Place the automatic door bottom against the door Once you have the automatic door bottom leveled and positioned correctly, with a pencil or marker mark where the attachment screws need to be drilled. |
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STEP 3: ATTACHING THE AUTOMATIC DOOR BOTTOM
To make installation easier you can drill a pilot hole which will ensure you attach the door bottom to the correctly marked spot. With the screws provided, screw in the automatic door bottom. In some models, a plate is provided for the hinge side of the frame. This will protect the door frame from getting worn down by the actuating plunger. If provided, attach to corresponding point on the frame. |
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STEP 4: TESTING YOUR AUTOMATIC DOOR BOTTOM
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Once you have followed through with all the instructions your Automatic Door Bottom is good to go! Enjoy years of quality sound, draft and light infiltration control with your new door bottom.
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