Sihe DKT/SDKT external-rotor HVAC fans

The component and cabinet need different quotation scopes

The sheet says DKT has an external-rotor motor integrated with the fan, forward-curved stamped blades and static/dynamic balancing. SDKT encloses that fan and adds acoustic wall lining. A price for one should not be compared with a price for the other without identifying the casing, panel access, lining and connection scope. The document does not give a complete bill of materials or prove a measured insertion loss for the cabinet.

Resolve the configuration column before setting fan speed

Entries such as 11–45 in the performance table cannot responsibly be used as rpm when the SDKT dimension table labels matching entries as models/configurations. The reviewed page supplies no explanation of the code or correction to the heading. Keep the printed code and ask Sihe for the actual impeller speed, supply frequency, motor and ordering designation.

The size-2 / 11–45 row lists 0.25 kW and four poles, airflow 900–1,500 m³/h and total pressure 315–295 Pa. A motor-pole figure does not correct the ambiguous speed column, and the ranges do not define one simultaneous maximum duty. Require a marked curve with speed, density and pressure basis. If another row or motor is selected, obtain its own current document and matching drawing.

Match flange and envelope symbols to the exact variant

The SDKT fixing-size drawing separates inlet dimensions A1–A4 from outlet dimensions B1–B4, then adds external/support symbols in a second table. For size 2 / 11–45, A1 is 323 and B1 is 194; these describe different connection features. The same size also has a 12–63 drawing with different inlet dimensions. Do not choose a flange pattern from nominal size alone.

Request a controlled outline with units, hole spacing, supports, mass and service-side clearances. Match the selected code to both tables and the offered cabinet. Reserve access for removing panels and the DKT assembly after ducts and ceilings are installed. The image's dimensions are useful coordination evidence, but do not replace the supplier's order drawing or a structural support design.

Treat acoustic lining and the HTFC comparison as separate claims

The sheet says SDKT has sound-absorbing wall lining and claims lower noise and favourable flow/pressure compared with HTFC at the same nominal size. No matched operating points, acoustic method or comparative test report accompany that statement. It is not a basis for promising a particular reduction against any other manufacturer's HTFC.

The performance table prints noise in dB(A) without a clear measuring distance or sound-power basis. Specify the selected operating point, cabinet/lining construction, inlet/outlet arrangement and test method, then request the actual acoustic result. A hospital or hotel application mentioned in the catalogue does not itself demonstrate a room-noise target, fire classification of lining or hygiene approval.

Confirm the permissible medium and motor/control package

The technical description permits air or harmless non-self-igniting gas, excludes particulate matter and also states a dust-content limit of 150 mg/m³. Ask for the intended distinction between dust and particles if the stream contains solids. Temperature, corrosive service, hazardous-area suitability and ingress protection are not established by the reviewed DKT/SDKT material.

The external-rotor construction is not proof of compatibility with an arbitrary controller. Obtain the exact motor/supply, wiring, permissible control range and protection, particularly for a variable-air-volume application. Agree controller, guards, isolation and electrical installation responsibilities. Bare motor rating is not a measured cabinet electrical input at the project duty.

Ask for one consistent selection and delivery package

The response should identify DKT or SDKT, nominal size, corrected ordering code and speed, motor/control schedule, marked total-pressure curve and matching dimension revision. For SDKT, include cabinet materials, lining, panels, connections, supports and service access. Clarify the dust wording and provide test records for the actual assembly where required.

Agree delivery and installed acceptance separately: identification/dimensions and specified running records at shipment, then airflow, pressure basis, current/input and controls under the approved installed conditions. No MOQ, lead time, price, current model certification or warranty was established. The original two inspected sheets support these questions; they do not document a completed test on your order.