Qili cabinet centrifugal fans · choose the family and configuration

Distinguish HTFC from the neighbouring catalogue families

The catalogue’s separate KDF/HTFC-V and GDF entries are not alternative names proving the same impeller, casing or performance. Select the appropriate family and then request its own complete designation, curve and drawing. For HTFC, identify size, A/B construction, I–IV speed type and the inlet/outlet arrangement.

The article offers twelve inlet/outlet angle arrangements, but no selected arrangement drawing is provided in the reviewed text. Have the supplier label the actual inlet, outlet, handedness and rotation on the approved general arrangement. A large family maximum or the external-motor photo cannot establish a particular flow direction, available pressure or fitting geometry.

Use airflow and total pressure at one selected speed

Issue actual airflow, system resistance and air temperature/density, with minimum/normal/maximum requirements. Ask for the curve and selected operating point with motor loading. The family’s 85000 m³/h and 1000 Pa maxima are not combined into an available rated point; different sizes and speeds produce different selections.

For I/III versus II/IV, obtain each offered speed and duty explicitly. The supplier mentions a variable-frequency motor/controller option and suggests 25–50 Hz operation. That is a published recommendation, not proof that every motor or smoke-qualified assembly permits variable-frequency operation. Agree the exact motor/drive and allowable range, particularly when a separate fire mode changes control requirements.

Keep the ordinary, hot-air and smoke conditions separate

The article states continuous ordinary operation at −20 to +40°C and air humidity below 90%. It separately claims 100°C for twenty hours and 300°C for sixty minutes, with an earlier description claiming more than sixty minutes at 300°C for A construction. It refers to historical GA211-1999 testing but does not attach the original full test report in this item.

For a required smoke duty, obtain exact-model documentation, covered motor/drive arrangement, installation limitations, temperature-duration requirement and relevant current qualification status. Do not apply the external-motor A claim to a B assembly or equate historical testing with current acceptance. Normal duty, high-temperature operation and emergency qualification need their own approved schedules.

Separate explosion-protection options from ordinary construction

The text says an explosion-protected version can be made and prints “EXdIIBT4”. It does not establish applicable exact-model certification, zone selection or suitability for an arbitrary gas/dust atmosphere. State the real atmosphere and have the responsible designer specify the required protection.

Request documentation for the complete selected assembly and its electrical/mechanical components, with the exact protection marking and operating conditions. The standard cabinet or red motor photograph is not proof of an explosion-protected product. Do not mix this optional protection claim with ordinary ventilation or smoke evidence when comparing offers.

Allow accessory losses, length and service space

The standard list includes impeller/casing, motor, housed bearings, shaft, pulleys and belt, sound-treated cabinet and inlet/outlet flanges, with a belt guard for A. Optional items include vibration isolation, silencers, filters, a control box, mating flanges and an A motor rain cover. Obtain the actual quoted component list rather than assume all illustrated or named features are included.

For primary/medium/high-efficiency filters, the article specifically calls for additional pressure-loss allowance and increased casing length. Agree the actual filter grade, clean/loaded resistance, removal route and maintenance access. Silencers and thicker cabinets likewise need selected acoustic and dimensional evidence. Reserve motor/belt/bearing access and approved supports; a supplier statement about low noise is not a room sound prediction.

Approve a complete assembly and verify the installed duty

Require selected dimensions, operating mass, opening orientation, material/coating specification and service instructions. The supplier describes galvanised construction and a cabinet insulation/lining arrangement, but no selected acoustic test or application-specific material result is established. Agree commercial terms and destination service separately.

1. Select the family and scope

   Issue duty/air conditions, required operating modes, atmosphere, electrical/control interface and accessories.

2. Approve the actual documents

   Match full designation, curves, drawings, motor/drive and any fire/explosion qualification; include filter losses and service clearances.

3. Record handover

   Verify identification, supports, rotation, measured duty and approved controls; retain maintenance and qualification records with exact-model coverage.