KFD-HD Heavy Duty Floor Door
SKU:KFD-HD
The KFD provides sturdy access in any concrete application. The KFD-HD is heavy duty (H20 loading). When required, door can be made watertight, spring assisted and equipped with a stainless steel snap lock.
| Door Size H × W (in.) |
Door Size H × W (mm) |
Shipping Wt. (lbs.) |
Shipping Wt. (kg.) |
|---|---|---|---|
| 24 × 24 | 610 × 610 | 71 | 32 |
| 30 × 24 | 762 × 610 | 81 | 36.8 |
| 30 × 30 | 762 × 762 | 93 | 42.3 |
| 36 × 24 | 914 × 610 | 91 | 41.4 |
| 36 × 30 | 914 × 762 | 105 | 47.7 |
| 36 × 36 | 914 × 914 | 118 | 53.6 |
| 48 × 36 | 1219 × 914 | 147 | 66.8 |
| 48 × 48 | 1219 × 1219 | 181 | 82.3 |
| 72 × 48 | 1828 × 1219 | 248 | 112.7 |
Spec Sheet / CAD Files
Download the architectural specification sheet and CAD drawings for this product.
The KFD-HD is a hinged heavy duty floor door for concrete, rated for H20 loading. It is the door to specify where a vehicle crosses the opening: loading docks, service drives, plant yards, warehouse aisles, utility vaults and any floor a forklift, van or truck runs over. Where the opening only sees foot traffic and hand carts, the KFD-SD at 300 pounds per square foot is the right door and the lighter one to handle.
What H20 loading means
H20 is an AASHTO highway loading case: a two-axle truck with a 32,000 pound axle load, which works out at 16,000 pounds per wheel. Karp rates the KFD-HD for H20 loading without impact, meaning the rating covers the static wheel load rather than an added impact factor for vehicles crossing at speed.
Rate the door for the heaviest thing that will ever cross it, including during construction and during plant changeovers, not for what crosses it on a normal day. A door specified below the traffic it sees deflects first, then rattles, then becomes a trip hazard in a floor people walk across.
How it is built
Diamond tread plate door in an aluminum extruded frame with integral anchor flanges, so the frame keys into the pour rather than sitting on it. Hinges are stainless steel. The frame is mill finish with a bituminous coating applied to the exterior, which is the face in contact with the concrete and the first surface that would otherwise corrode.
Options worth settling before the order
- Watertight construction adds a drain channel and a neoprene gasket. Specify it for wash-down floors, external and semi-external slabs, and anywhere the space below has to stay dry. Non-watertight construction is also available.
- Spring assistance uses stainless steel compression springs. This is not optional in practice at the larger sizes: a 48 x 48 door has a shipping weight of 181 pounds and a 72 x 48 is 248 pounds. Springs are what make a door that heavy openable by one person and controlled on the way back down.
- Locking and latching is available as a staple, staple and hasp, stainless steel snap lock, brass pentahead or keyed cylinder lock. Pentahead is the usual choice on utility and municipal work where a standard key should not open the door.
Sizes and ordering
Nine standard sizes, 24 x 24 through 72 x 48 inches, with shipping weights from 71 to 248 pounds. Those weights decide two things: how the structural opening is framed, and how the door gets handled on site. The full table with metric equivalents is below. Karp builds floor doors to order, so send the clear opening, the load case and whether the opening needs drainage, and the sales team will confirm the configuration.
