Home > FRP Rooftop Exhaust Fans: Slope, Elbow and FRP DWT-I

FRP Rooftop Exhaust Fans: Slope, Elbow and FRP DWT-I

FRP — glass-fibre-reinforced plastic, also called fibreglass — is the housing material of three rooftop fan lines on this site: the slope-type FRP fan, the elbow-type FRP fan, and the FRP axial flat DWT-I fan. This page carries all three, each with the specification table from its own source page, and with the FRP-only gas limits stated only in the DWT-I section, where the source page states them.

Slope-type FRP rooftop exhaust fan

The slope-type page describes a roof-mounted industrial exhaust fan with a waterproof dome-shaped cap, a wind deflector, six axial blades and a modular design, for factories, poultry houses, greenhouses and warehouses in Southeast Asia's climate. Its features are a hand-laid glass-fibre-reinforced plastic shell with a secondary-treated smooth surface, SMC glass-fibre blades in a six-blade assembly with 7 nylon blades and 3 cast aluminium blades as options, a 1.9-metre awning against rain, and a direct-drive design. The page adds a note that special voltage and power parameters can be customized. Its two models both run at 560 rpm on 380 or 220 V at 50 Hz.

The slope page lists industrial applications across textile, garment and hosiery, glass, molding, rubber, coating, toy, electronics, shoe, printing, food, dyeing and laundry workshops; agricultural applications across large farms, greenhouses and livestock farms; and civil applications across net bars, stores, supermarkets, halls, food markets, waiting rooms and recreation places. The hole sizes in the table — 1400 by 1400 mm and 1000 by 1000 mm — are the roof openings the two models take, and they are the only hole sizes any source page tables.

Elbow-type FRP rooftop exhaust fan

The elbow-type page describes a fibreglass exhaust fan for medium and large factories that creates a negative-pressure indoor environment while introducing fresh air, and calls it lightweight, easy to install and low in energy consumption, with a smooth-surfaced FRP housing that is UV and weather resistant for indoor and outdoor use. Its features are an SMC fibreglass frame and blades, a direct-connected motor with a simple structure, PVC shutters against flies and backflow, and blade materials customizable to cast aluminium, nylon or stainless steel. Its four models run at 540 rpm, except the smallest at 680 rpm, on 380 or 220 V at 50 Hz, and it is the only family page that publishes noise figures.

The elbow page lists industrial applications across textile mills, garment and hosiery, glass, plastic molding, rubber, coating and painting, toy, electronics, footwear, printing, food processing, dyeing and industrial laundry; agricultural applications across large-scale farms, greenhouses and poultry and livestock; and commercial and public applications across internet cafes, retail stores, supermarkets, exhibition halls, food markets, waiting areas and recreational spaces. Its noise figures — 65, 60, 60 and 55 dB from the largest to the smallest model — belong to this family only and are not transferred to any other page.

FRP axial flat DWT-I rooftop fan

The FRP DWT-I page describes a fan with a molded axial-flow or centrifugal impeller, a fan-specific motor in direct drive, an anti-corrosion wind cap, and a metal or glass-fibre-reinforced plastic wind-cylinder base, with a steel outer cylinder and motor bracket, a fibreglass roof cap described as corrosion and UV resistant, and a safety net. Optional accessories named on the page are gravity or electric check valves, anti-bird and insect nets, maintenance switches and a centralized control box. Its performance table matches the carbon-steel page row for row except the largest model: DWT-I-11.2A reads 7.5 kW at 960 r/min, with a volume flow of 41,000 to 53,800 m³/h and a total pressure of 275 to 205 Pa. That top flow figure, 53,800 m³/h, is this page's own figure, quoted here and not unified with the carbon-steel page's figure.

Gas limits stated on the FRP page only

The FRP DWT-I page — and only that page — states limits for the gas to be transported: the gas must be free of sticky substances, the gas temperature must not exceed 80 °C, and the mass of substances in the medium must not exceed 150 mg/m³. Those limits are stated here because this is the page they belong to, and they are not transferred to the carbon-steel page or to any other family. A buyer moving hot, dusty or sticky gas must check the actual gas against these limits in the inquiry, and must not assume that another family carries the same limits, because no other source page states them.

Overall dimensions — FRP page only

The dimensions table below uses the FRP page's own seven-column scheme: columns diameter A, diameter B, C, D, E, F and H, all in millimetres. The H column reads 68 mm on every row, as printed on the source page; the FRP page uses a different dimension scheme from the carbon-steel page, so its columns are not interchangeable with the carbon-steel table and its H figures are not fan heights. This table belongs to the FRP page only and is never carried onto the carbon-steel page.

The FRP DWT-I page lists industrial facilities, warehousing and logistics, transportation hubs, commercial and public buildings, and energy and infrastructure projects among its applications. As with the carbon-steel page, only the eleven tabled rows carry per-model specifications, and the page-level series claims from the carbon-steel page are not repeated here as FRP facts.

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