Zhongkai HTFC cabinet fans · speed, dimensions and smoke-duty evidence

Use one complete designation, not HTFC alone

A/B motor position and I/II speed are different selection dimensions. The table’s I-type heading cannot supply missing two-speed curves. Specify the full designation, fan size, arrangement, rotation, outlet direction and each required operating speed. Confirm the actual motor and drive match that schedule.

The drawings show multiple inlet/outlet configurations and floor/suspended forms. Obtain a project drawing that identifies connection faces, mounting orientation, motor position and servicing space. The picture of an external motor does not prove the quoted internal-motor configuration will have identical dimensions or temperature exposure.

Keep airflow and static pressure paired

For size 9 at 1,600 r/min, the first listed point is 2,270 m³/h at 499 Pa static, and the second is 2,600 m³/h at 515 Pa. They are separate operating points. Taking the largest airflow and highest pressure from different rows would create a rating the sheet does not give.

Issue the project airflow and resistance calculation, including ducts, fittings, dampers, silencers and terminals, with the pressure basis. The original column says static pressure, so do not silently treat it as total pressure or the remaining pressure after external accessories. Request the full curve, air-density/test conditions, stable operating range and motor loading for the selected arrangement. The catalogue power column is not independently measured absorbed input.

Normal ventilation and emergency smoke duty need separate schedules

The sheet describes dual ventilation/smoke-exhaust use and claims continuous operation over 40 minutes with smoke above 280°C. Preserve the source wording rather than convert it into an independently certified temperature class. Match the required project temperature/duration, size, speed, motor location and accessory arrangement to a complete report and applicable current approval.

The historical certificate montage lists HTFC-II-33 as its unit/main type and II-30, II-25, II-27.5 and II-22 as included models. It does not establish that every I-type table size is covered. Printed validity ended in 2024; a newer document and issuer-status verification are needed if certification is an order condition. Management-system or laboratory logos alone cannot substitute for this model-specific evidence.

Include the allowances hidden below the dimension table

The dimension note excludes an 80 mm footframe from A/B casing height. For A, motor height and beltguard thickness are also excluded from the relevant casing dimensions. A plantroom or support selected from casing H/W/B alone may therefore be too small. Ask for the total installed envelope, weight, centre of gravity, supports and lifting arrangement.

For the size-9 example, the table gives an outlet 310 × 260 mm and inlet 500 × 350 mm. These are catalogue connection references, not a guarantee the project’s chosen outlet orientation has the same accessible transition space. Coordinate flexible connections, transitions, vibration isolation and duct supports without transferring duct load into the fan casing.

Check media and acoustic conditions before relying on promotional claims

The technical sheet limits sticky material and dust/hard-particle content. Application illustrations include garages, tunnels and drying rooms, but those photographs do not establish suitability for corrosive, grease-laden, explosive or continuously hot process exhaust. Agree the medium, temperature, contaminants and relevant materials/protection with the supplier and designer.

The table publishes dB(A) values without a reproduced measurement distance, sound-power/pressure distinction or complete test method. A noise number cannot predict a room boundary level on its own. Obtain the relevant acoustic data and assess ducts, breakout, attenuation and vibration for the installation. The graphic’s explosion-proof wording is not a reproduced motor approval; confirm an appropriate approved motor if that requirement applies.

Hand over a selection that can be checked on site

The eight original images contain useful diagrams and a numerical sheet alongside generic promotional claims. The useful order package is the selected technical schedule and evidence, rather than a promise of high efficiency, long life or a rapid response.

1. Design review

   Agree normal/emergency airflow and static-pressure points, full fan designation, operating speeds and applicable smoke duty.

2. Manufacturing approval

   Approve curves/motor loading, complete envelope/connection drawing, controls/interlocks and current model-matched evidence.

3. Commissioning

   Record rotation, speed, airflow/static pressure, current, vibration and control changeover at the agreed conditions; obtain maintenance and spare-drive instructions.