Annaite DBF fan boxes · A/E selection and installation brief

Compare complete table rows at the required airflow

For DBF40 the A-fan table lists 4,000 m³/h, 373 Pa, 0.8 kW × one motor, 930 rpm, 60 dB(A) and a reference weight of 180 kg. At the same 4,000 m³/h, E-table DBF40 rows a/b/c list respectively 330/495/680 Pa, 0.75/1.1/2.2 kW, 66/68/70 dB(A) and 280/290/300 kg. These are different listed selections, not interchangeable maximum values.

Choose the duty before the drive/motor row and request its fan curve and operating limits. The table does not state rated air density, measurement arrangement or a guaranteed acoustic result in the buyer’s room. Motor rating is not measured electrical consumption at every operating condition.

Resolve pressure terminology before checking duct resistance

The E-table header labels its Pa column as residual pressure. The printed DBF80EaY2 example below it describes 8,000 m³/h, 700 Pa and 3 kW, calling the pressure total pressure. The row-a values themselves agree with the 700 Pa/3 kW entry, but the pressure terminology differs. This review retains the discrepancy rather than treating both descriptions as an external-static-pressure guarantee.

Have the supplier define whether the selected figure is total, static or available pressure at the agreed boundary, and state what cabinet/filter losses are included. Give the actual duct and accessory resistance, with filter condition and silencers identified. Obtain a selected-duty schedule/curve using the same pressure definition as the project calculation.

Use the twelve-port diagram with an approved orientation drawing

The original diagram numbers twelve inlet/outlet arrangements, including upper/lower discharge and side-inlet alternatives. The code image illustrates DBF–40–A–Y–2 and maps Z/Y/M/N to left/right/top/bottom shaft arrangements, with the inlet-facing viewpoint stated. The E-table worked example instead calls Y the left-side arrangement.

Do not reverse a cabinet or select maintenance access by relying on the letter alone. Send a plan/elevation marking airflow arrows, inlet-facing viewpoint, shaft/motor/filter side, chosen numbered arrangement and access space. Ask the supplier to resolve the Y wording and confirm the actual approved drawing revision.

Specify the acoustic cabinet and maintenance arrangement

The written construction describes galvanised impeller/casing, a detachable cold-formed metal frame, coloured outer panels, an inner microperforated galvanised acoustic layer and fine glass-wool infill. An aluminium-alloy frame is optional. It permits suspended or floor-mounted installation and site assembly/disassembly.

Request the selected panel specification, fan/motor access, inspection opening and frame/support arrangement. For a suspended installation, confirm weight, lifting and structural-support requirements on the actual drawing rather than using a reference table weight as the installed load. For a belt arrangement, include the space and procedure for drive inspection/tensioning. Listed dB(A) values have no reviewed measurement distance or spectral data, so request the acoustic information needed for the building design.

DSF high-temperature wording belongs to the modified smoke unit

The source states that the modified DSF uses high-temperature structural panels and places the motor/transmission outside the cabinet, claiming operation above 280°C for more than 100 minutes. This is supplier wording for that version; no exact-configuration test report establishing it was reviewed. It is not assigned to normal DBF.

If the enquiry is for smoke extraction, identify the required duty, exact assembly, motor/drive/control arrangement and applicable conformity/test documentation for the destination. Inspected fire-gallery attachments concern dampers, the energy-efficiency report cover concerns SWF-13, and the explosion document concerns BDWEX-900. They cannot certify this DBF or a proposed DSF variant.

Approve the full selection, installation and acceptance brief

The table images show performance examples but no complete dimensional schedule for the selected cabinet was established in the reviewed entry. Electrical supply, starting/control method and accessory inclusions also require an order-specific offer. The supplier’s twelve-month-from-dispatch warranty and fault/geographic exclusions should be confirmed in the written order.

1. Define the operating point

   Supply airflow, clearly defined pressure/resistance, air conditions, electrical supply and acoustic objective; select the exact A/E row with its curve.

2. Approve physical configuration

   Resolve Y/shaft wording, port number and viewpoint; obtain dimensions, maintenance access, cabinet materials, weight and support/lifting details.

3. Set acceptance and service terms

   Agree performance/acoustic test conditions and boundaries, configuration-specific documents, accessory scope, dispatch-based warranty and destination support.