Pemko 145 Series Fire-Rated In...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$143.25
$121.99
Pemko 145 Series threshold cross-section drawing showing 4" (101.6 mm) width, 7/8" (22.2 mm) height, weep hole locations, and optional pan callout

Pemko 145 Series Fire-Rated Interlocking Threshold with Water Return

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Model: 145D72
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$143.25
$121.99
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Pemko 145 Series Fire-Rated Interlocking Threshold with Water Return

The Pemko 145 Series is a fire-rated interlocking threshold engineered for pre-hung door openings where water intrusion and fire code compliance are both requirements. At 4" wide x 7/8" high, it fits standard residential and light commercial door frames and ships with a #61 J-hook and nails for a complete installation. Available in Mill Finish and Dark Bronze Anodized aluminum, in 36" and 72" lengths (custom lengths from 24" to 185" available).

Features & Benefits

  • Fire-Rated: UL 10C positive pressure certified and cUL Listed 4L10 - meets code requirements for fire-rated door assemblies.
  • Water Return System: Integrated channel catches water driven or running under the door and returns it to the exterior, preventing interior moisture damage.
  • Interlocking Design: Mates with the door bottom for a positive seal at the sill.
  • Aluminum Construction: Corrosion-resistant aluminum base; available in Mill Finish (145A) and Dark Bronze Anodized (145D).
  • Complete Installation Hardware: Furnished with #61 J-hook and nails; alternate hooks available for non-standard applications.
  • Flexible Lengths: Stock in 36" and 72"; custom cut from 24" minimum to 185" maximum to fit any opening width.
  • Optional Pan Accessory: Companion pan available separately for enhanced water management in high-exposure conditions.

Technical Specifications

  • Dimensions: 4" W x 7/8" H
  • Material: Aluminum
  • Finish Options: Mill Finish Aluminum (A), Dark Bronze Anodized Aluminum (D)
  • Available Lengths: 36", 72" (custom: 24" min - 185" max)
  • Certifications: BHMA Certified, UL 10C Positive Pressure Fire Rated, cUL Listed 4L10
  • Installation Hardware: #61 J-hook and nails included

Typical Applications

  • Fire-rated door assemblies in commercial and multi-family buildings
  • Pre-hung residential and light commercial entry doors
  • Multi-unit residential and hospitality properties
  • Educational and healthcare facility doorways requiring fire-rated thresholds
  • Weather-exposed openings requiring active water return

Product Specs

Subcategory:
Thresholds
ANSI/BHMA:
BHMA Certified, Fire Rated UL10C Positive Pressure, cUL Listed 4L10
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Thresholds
Product Type:
Residential Thresholds and Sills for Pre-Hung Openings
Commercial/Residential:
Commercial/Residential
Product Model:
145
Product Dimension:
W: 4", H: 7/8"
Product Category:
Door Trim and Accessories
Product Substrate:
Aluminum
Department:
Door Hardware
Series:
145 Series

Pemko 145D72 – Frequently Asked Questions

1) What length Pemko 145 threshold do I need for a standard 3-0 door, and what about a pair of doors?
The 145 Series threshold is stocked in 36 inch and 72 inch lengths. The 36 inch covers a single 3-0 opening; 72 inches spans a pair of 3-0 doors (36 plus 36). If your opening falls between those, the 145 is cut to order anywhere from 24 inches up to 185 inches, so odd frame widths and wide openings are handled without splicing two pieces together. Measure frame to frame at the sill, not the door slab, since the threshold runs the full width of the jamb.
2) Is the Pemko 145 threshold approved for use on a fire-rated door assembly?
Yes. The Pemko 145 Series threshold is UL 10C positive pressure fire rated and cUL Listed under 4L10, and it is BHMA Certified. That combination is what a fire door assembly needs at the sill in both US and Canadian jurisdictions, which is why it turns up on multi-family unit entries, healthcare and education openings where the sill has to carry a rating and still shed water.
3) Does the Pemko 145 interlocking threshold require anything on the bottom of the door?
It does, and the part comes with it. An interlocking threshold only seals when a hook on the door bottom drops into the threshold channel as the door closes, so the 145 ships with a #61 J-hook and nails. The hook fastens to the door bottom and engages the 145 as the door swings shut; that engagement is what gives you the air and sound seal at the sill, not just contact. Alternate hooks are offered for openings where the #61 is not the right profile. Budget install time for both halves, the threshold at the sill and the hook on the door.
4) I get water blowing under an exterior entry door. Will the Pemko 145 threshold stop it?
That is the specific problem the 145 is built for. Water driven or running under the door is caught in an integrated channel and returned to the exterior instead of being allowed to reach the interior floor. It is a return system, not just a raised dam, so it handles running water rather than only splash. For openings with heavy exposure, a companion pan is available separately and sits under the threshold for a second stage of water management. On a covered or protected opening you can skip the pan.
5) Will a 4 inch wide threshold fit my pre-hung door frame?
The 145 measures 4 inches wide by 7/8 inch high, which is sized for standard residential and light commercial pre-hung frames. The 4 inches is the depth across the sill from interior to exterior, and it has to land inside the jamb legs, so check the sill depth of your frame before ordering. The 7/8 inch is how far the threshold stands proud of the floor, which matters for door bottom clearance on a replacement, since the door has to close over it and engage the hook.
6) Interlocking threshold or a plain saddle threshold, which one should I be buying?
Go interlocking, like the Pemko 145, when the opening is weather exposed or you need a real seal at the sill. The hook on the door bottom engages the threshold channel, which is what cuts air infiltration and sound transmission and lets the water return work. The cost is that the door itself has to carry the mating hook, so it is a two-part install. A plain saddle or bumper threshold just sits on the sill and relies on a sweep or door bottom pressing against it, with no door-bottom hook to fit; that is the easier retrofit on an interior or protected opening where you only need to cover the floor joint. If the door is taking wind-driven rain, the saddle will not keep up.
7) My opening is not 36 or 72 inches. Can the Pemko 145 be cut to my width?
Yes, the 145 is cut to order from 24 inches up to 185 inches. That covers everything from a narrow utility door to a wide storefront or double opening in one continuous piece. Below 24 inches or past 185 it is out of range. Give the frame-to-frame sill measurement when you order; the 4 inch width and 7/8 inch height do not change with length.
8) I need the threshold to match dark bronze doors across a building. What finishes does the Pemko 145 come in?
Two: mill finish aluminum, ordered as the 145A, and dark bronze anodized aluminum, the 145D. Both are available in the 36 inch and 72 inch stock lengths, so a property standardizing on dark bronze can order the same 145D at both single and pair openings. Mill finish is the raw aluminum look and is the usual pick where appearance at the sill does not matter; the anodized bronze is the one to specify when the threshold sits in view alongside bronze frames or entry hardware.
9) What comes in the box with the Pemko 145 threshold, and what else do I have to order to finish the install?
The threshold ships with a #61 J-hook and nails, so the door-bottom hook that makes the interlock work is included rather than sold separately. What is not included is the pan; that companion accessory is ordered separately and is worth adding on high-exposure openings. If the #61 profile is wrong for your door, alternate hooks are available. Anchors into the substrate are a job-condition call, since a wood sill and a concrete slab do not take the same fastener.
10) Can I standardize on the Pemko 145 across both apartment unit entries and exterior building doors?
Yes on both counts. The 145 is rated for commercial and residential use, carries the UL 10C positive pressure fire rating and cUL 4L10 listing that unit entry doors in a fire-rated assembly need, and has the water return that exterior building doors need. One SKU family covers both conditions, in one finish, which is how multi-family and hospitality portfolios keep the parts list short. The aluminum body is corrosion resistant, so the exterior openings are not a different material spec from the interior ones.
How fast can I get the Pemko 145D72 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Pemko 145D72 come with a warranty?
Absolutely. The Pemko 145D72 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Pemko 145D72?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Pemko 145D72 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

Product Reviews

  • 5
    Pemko 145

    Posted by Ethan on Jun 25th 2024

    This is solid and keeps water out effectively.

  • 5
    Great for Keeping Water Out

    Posted by Wesley on Jun 20th 2024

    It’s a great investment for weatherproofing.

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