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Commercial Rooftop Exhaust Fans

Commercial rooftop exhaust fans serve stores, supermarkets, halls, food markets, waiting rooms and other public spaces, where the fan must move air without becoming the loudest thing in the building. The elbow family is the one source page that publishes noise figures, and the FRP families are the ones whose application lists name commercial and public buildings.

What the source pages list for commercial buildings

The elbow-type page lists commercial and public applications: internet cafes, retail stores, supermarkets, exhibition halls, food markets, waiting areas and recreational spaces. The slope-type page lists civil applications: net bars, stores, supermarkets, halls, food markets, waiting rooms and recreation places. The FRP DWT-I page lists commercial and public buildings among its applications, and the carbon-steel DWT-I page lists high-level civil buildings. A commercial buyer therefore has four pages of application evidence, but the evidence differs in kind: the FRP slope and elbow pages name the building types, while the DWT-I pages name the building class. Model selection still comes from the tables.

Noise figures, and which page they belong to

The elbow table is the only table on the four source pages that lists a noise column. Its four models read 65 dB for DH-1460EL, 60 dB for DH-1260EL, 60 dB for DH-1060EL, and 55 dB for DH-850EL. Those figures belong to the elbow family only, and this site does not transfer them to any other family: the slope, carbon-steel DWT-I and FRP DWT-I pages publish no noise figures, so no noise claim is made for those families anywhere on this site. A buyer with a strict noise limit should treat the elbow figures as the verified starting point and ask for the corresponding figure for any other family being considered, rather than assuming a quieter or louder result.

Airflow and size for commercial roofs

The elbow models run from 28,000 to 45,000 m³/h, with overall dimensions from 850 by 850 by 480 mm on the smallest model to 1460 by 1460 by 580 mm on the largest. The slope models run at 28,000 and 45,000 m³/h, with dimensions of 1060 by 1060 by 930 mm and 1460 by 1460 by 960 mm, and roof hole sizes of 1000 by 1000 mm and 1400 by 1400 mm. Commercial roofs often have limited curb space and shared roof access, so the overall dimensions and the hole size matter as much as the airflow: a fan that fits the opening and the access route is worth more than a larger fan that cannot be installed. The elbow page describes its fan as lightweight and easy to install, and the FRP housing as smooth-surfaced, UV and weather resistant, for indoor and outdoor use — all elbow-page wording, quoted as such.

Housing material in commercial service

The slope and elbow families use glass-fibre-reinforced plastic housings, and the FRP DWT-I family uses a fibreglass roof cap described as corrosion and UV resistant, with a steel outer cylinder and motor bracket and a safety net. For a commercial roof that sees sun, rain and public access, a corrosion-resistant housing and a safety net are practical points to check, and they are points the source pages actually state, unlike finish or warranty claims that the source pages never make. The DWT-I pages list optional accessories — gravity or electric check valves, anti-bird and insect nets, maintenance switches and centralized control boxes — which are worth asking about for a commercial installation where backflow, birds and maintenance access all matter.

What to confirm before ordering

• The exact model and its tabled airflow, dimensions and noise figure, from the family page that publishes them.
• The voltage at the fan position: slope and elbow models are tabled at 380 or 220 V, 50 Hz.
• The roof opening and curb: slope hole sizes are tabled; elbow and DWT-I dimensions are tabled per family.
• MOQ, lead time and warranty, which no source page states and which must be confirmed before payment.

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