Sound Resistant

STC Acoustical Access Door

SKU:STC

An access panel is usually the weakest point in an acoustically rated wall. The Karp STC is built so it isn't: a 20 gauge steel door over 2 3/8 in. of acoustical insulation, sealed by a full-perimeter neoprene gasket that a keyed compression latch pulls tight. Independently tested and rated STC 64.

Size:

Quantity:

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Door Size H × W (in.)	Door Size H × W (mm)	Wall/Ceiling Opening H × W (in.)	No. of Stud Catches/Latches	Shipping Wt. (lbs.)	Shipping Wt. (kg.)
12 x 12	305 × 305	12 3/8 × 12 3/8	1	6.3	2.9
18 x 18	457 × 457	18 3/8 × 18 3/8	1	10.5	4.8
24 x 24	610 × 610	24 3/8 × 24 3/8	2	16.0	7.3

Spec Sheet / CAD Files

Download the architectural specification sheet and CAD drawings for this product.

STC CAD Drawing

Construction

16 gauge steel frame, 20 gauge steel door
2 3/8 in. acoustical insulation; 2.40 in. door depth, 2.60 in. total assembly depth
3/8 × 1/8 in. closed-cell neoprene gasket around the full perimeter
Keyed lift-and-turn compression latch, chrome finish with chrome cup sealing gasket
Continuous piano hinge
One-piece 1 in. wide trim
Rust-inhibitive electrostatic powder prime coat with baked white enamel
Also available in stainless steel with a No. 4 finish
Independently tested to ASTM E1332, ASTM E90 and ASTM E413

Where it's used

Recording studios, broadcast suites and rehearsal rooms
Mechanical and plant rooms adjoining occupied space
Hotel corridors and guest room demising walls
Hospitals, consulting rooms and spaces with speech privacy requirements
Classrooms, lecture theatres and examination rooms
Tenant demising walls where the wall's rating must carry through the panel

Choosing a size

The wall opening is the door size plus 3/8 in. — a 24 × 24 in. door needs a 24 3/8 × 24 3/8 in. opening. Overall trim dimension is the door size plus 2 in. in each direction, so allow for that on the finished face. Specify the smallest door that still gives working access to the equipment behind it: every extra square inch of panel is extra area for sound to pass through. Special sizes are available on request.

Frequently Asked Questions

Is the STC fire-rated?

No. This door is acoustic only. For rated assemblies use the KRP-150FR through KRP-450FR range.

Why a compression latch instead of a cam latch?

The keyed lift-and-turn compression latch draws the door tight against the neoprene gasket. Without that compression the gasket doesn't seal, and an unsealed perimeter is where sound gets through regardless of how well the panel itself is insulated.

What is the difference between STC and NRC?

STC measures how much sound an assembly stops from passing through it. NRC measures how much sound a surface absorbs. For a door in a demising wall, STC is the figure the specification calls for — which is why this door is independently tested and rated to STC 64.