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Published on:2026-10-31
A quotation for a 45 dB acoustic door looks straightforward until another supplier offers an STC 45 door. Are the two equivalent? Not automatically. Before comparing prices, a contractor or importer needs to know what was measured, how the result was rated, and which door assembly the evidence covers.
This guide explains how to evaluate acoustic door ratings and turn a product enquiry into a specification that can be checked before production.
The decibel, written dB, is a unit used for several acoustic quantities. A product description that says only “45 dB” does not identify the test method, frequency range or rating procedure. Ask whether the figure is a nominal product option, a laboratory rating for a complete door set, or a measurement made between two finished rooms.
Do not subtract a brochure figure from a room noise level to predict the adjoining room. For example, an 80 dB source and a nominal 45 dB door do not establish a guaranteed 35 dB receiving-room level. Room acoustics, the surrounding construction and other transmission paths also influence the result.
Sound Transmission Class (STC) is calculated using ASTM E413 from laboratory transmission-loss measurements under ASTM E90. Weighted sound reduction index (Rw) is an ISO rating determined under ISO 717-1; laboratory airborne sound insulation measurements can be made under ISO 10140-2.
Both condense frequency-dependent performance into a single number, but their procedures differ. A nominal dB option must not be relabelled STC or Rw without the corresponding report. When a specification requires STC 45, ask for evidence reporting STC for the proposed assembly rather than accepting a generic “45 dB” statement.
A door leaf is only one part of the opening. The frame, perimeter seals, bottom sealing arrangement, glazing and hardware must work together. Evidence for a solid single-leaf door does not automatically establish the same result for a larger double-leaf door or a door with an observation window.
Compare the proposed product against the report and associated drawings. Record differences and obtain a documented assessment or suitable testing where needed. Do not treat a similar-looking product photograph as proof of equivalent acoustic performance.
Shenghao offers the following nominal acoustic door options:
| Nominal acoustic option | Door leaf thickness | Specification check |
|---|---|---|
| 30 / 35 dB | 70 mm | Confirm the selected grade and assembly evidence |
| 40 / 45 dB | 90 mm | Confirm seals, glazing, hardware and test scope |
| 52 dB | 110 mm | Review the complete assembly and surrounding room design |
These are product selection options, not a claim that every size and configuration has the same tested result. Door thickness alone does not establish STC, Rw or a guaranteed site reduction. View the custom acoustic door specification and finish options before preparing an enquiry.
For KTV, cinema or music rooms, review the noise spectrum with the project acoustician. A single-number rating can conceal weaknesses at frequencies important to the actual source, particularly bass-heavy playback.
Laboratories control transmission paths around the specimen. A finished building also contains walls, ceilings, ducts and service penetrations. Sound passing around the door can limit the room’s isolation even when the supplied door matches its laboratory configuration.
Agree the acceptance method before ordering: required door rating, room-to-room criterion, site test procedure and responsibility for installation are separate items. For practical site coordination, read our soundproof door seals and installation guide.
Send the room use, noise source, required rating system, quantities, finished opening sizes and wall thickness. Add a plan showing handing, single or double leaf, solid or glazed construction, finish, hardware and any separate fire or accessibility requirements.
Dongguan Shenghao Door Industry Technology Co., Ltd. offers single-color, wood-grain and upholstered finishes, with optional round or rectangular observation windows subject to configuration review. Contact Shenghao with your door schedule so the selected option, supporting evidence and production drawings can be aligned before manufacture.
No. Shenghao’s 90 mm leaf is offered with nominal 40 / 45 dB options. An STC claim requires the appropriate test evidence for the proposed assembly.
No. Specify and verify fire performance separately for the complete proposed door set.
Ask the designer to define the acoustic metric, target and evidence required before comparing supplier offers.
ASTM E90; ASTM E413; ISO 10140-2; ISO 717-1. These references explain measurement and rating terminology; they do not establish certification of a particular Shenghao product.