Pemko 4301_NBL Automatic Door Bottom

Non-Handed, Semi-Mortise and Full Surface

  • When ordering, must specify if the automatic door bottom is for a semi-mortise application so that shorter screws can be provided.
  • BHMA logo represents products that meet the requirements of ANSI/BHMA 156.22-2012 for latching force and air infiltration.
  • 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.
  • Available in any size ranging from 18" to 48".
  • All Pemko automatic door bottoms are provided at NET length.
  • All Pemko automatic door bottoms can be trimmed down by as much as 2" in the field (stock lengths only).
  • If non-stock sizes are ordered, order must note need to trim 2 inches from the size ordered.
  • The drop-bar seal actuation mechanism causes the drop-bar seal to always actuate on the hinge side first.
  • This feature prevents the seal from skidding along the floor / threhold while the door is being closed.
  • Door hang-up will not occur.
  • This automatic door bottom is supplied with a Nylon Brush ("NB") insert - item number P516062.
  • Standard color for this part is black, but it is also available in gray.


Air Infiltration Tested Air Infiltration Tested

Barrier-Free Barrier-Free

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 4301CNBL: C - Clear Anodized Aluminum with Gray Nylon Brush insert

D - Dark Bronze 4301DNBL: D - Dark Bronze Anodized Aluminum with Black Nylon Brush insert

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