Pemko 4131_RL Automatic Door Bottom

Non-Handed, Surface and Semi-Mortise

  • Smoother action positive seal mechanism. All Pemko automatic door bottoms consist of an aluminum case which surrounds a movable drop-bar seal. The drop-bar seal is actuated by a plunger which contacts the jamb as the door is closing, forcing the drop-bar seal down against the floor / threshold.
  • All models (except #420) include seals which are offered in two materials: soft closed cell sponge neoprene (R) which remains pliable down to -70°F and PemkoPrene® thermo-plastic elastomer (PK).
  • Especially over uneven surfaces, both PemkoPrene® (PK) and nylon brush (NB) provide excellent seals to keep out draft, dust, moisture, insects, fumes, light, and sound.
  • All models (except #430 and #412) are non-handed and reversible. Installation is fast and easy because disassembly is not required to change handing: simply flip the automatic door bottom and you’ve reversed the hand. The clean symmetrical square-shaped case design also provides for even flush mounting.
  • The line includes models which can be mounted to either wood or hollow metal doors.
  • End plates are provided for all mounting applications.
  • All Pemko automatic door bottoms seal up to a 3/4" gap under the door except 420 and residential models which seal 1/2” maximum.
  • Available in any size ranging from 18" to 48".
  • All Pemko automatic door bottoms are provided NET length.
  • All Pemko automatic door bottoms can be trimmed down by as much as 2" (stock lengths only). If non-stock sizes are ordered, order must note need to trim
  • 2 inches from the size ordered.
  • Lead line available upon request; consult Customer Service for options on profiles.
  • The drop-bar seal actuation mechanism (all models) causes the drop-bar seal to always actuate on the hinge side first. This feature prevents the seal from skidding along the floor / threshold while the door is being closed. Door hang up will not occur.


Air Infiltration Tested Air Infiltration Tested

Sound Tested - ASTM E90 Sound Tested - ASTM E90

BHMA Certified BHMA Certified

Smoke Tested - UL1784 Smoke Tested - UL1784

Fire Rated - UL10C - Positive Pressure Fire Rated - UL10C - Positive Pressure

Underwriters Laboratory 4L10 Underwriters Laboratory 4L10

GREENGUARD Gold Certified GREENGUARD Gold Certified


C - Clear 4131CRL: C - Clear Anodized Aluminum with Black Sponge EPDM insert

D - Dark Bronze 4131DRL: D - Dark Bronze Anodized Aluminum with Black Sponge EPDM insert

SN - Satin Nickel 4131SNRL: SN - Satin Nickel Anodized Aluminum with Black Sponge EPDM insert

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