QIYUE FAN · LAYOUT REVIEW

Double-Inlet Fan Layout Review: Check Both Inlets Before GA Approval

A double-inlet fan can fit inside the available equipment envelope while one intake path remains poorly defined. A wall, column, platform, drive arrangement or proposed connection may affect one side differently from the other. Before approving the general arrangement (GA), document both sides rather than relying on overall width or the inlet visible in a product image.

This page provides a two-sided procurement review record. It does not prescribe clearances, predict airflow distribution or approve an installation.

Define Side A and Side B on the actual drawing

Mark both inlet sides on the selected fan’s GA. State the drawing number, revision and viewing direction. Use those same labels on site photographs, layout sketches and supplier comments. “Left inlet” is ambiguous if the reviewer views the equipment from the opposite end.

Side A and Side B are project labels, not universal model designations. Do not assume that Side A always means the drive side. Identify the motor, drive and discharge separately so another reviewer can reproduce the same orientation.

Review the intake path, not just the fan footprint

AMCA describes how uneven or swirling inlet flow, obstructions, nearby fittings and accessories can affect installed fan performance. This supports reviewing the actual inlet surroundings and connection arrangement rather than treating an outline dimension as proof of acceptable inflow. It does not establish a universal minimum clearance for this project. AMCA system-effect guidance.

For each side, show whether air approaches through an open area, a duct connection or a plenum. Record nearby objects and their actual positions using site dimensions or approved drawings. Where the two sides differ, flag the difference for supplier review; visual symmetry alone does not prove equal flow or acceptable performance.

Copy one review record for each inlet

Create separate Side A and Side B entries. Do not close one entry merely because the other has been reviewed.

• Identification: equipment tag, GA number/revision, side label and viewing reference.
• Intake route: open inlet, duct or plenum; identify where the air comes from and attach the corresponding layout.
• Surroundings: walls, columns, platforms, nearby equipment, drive or guard. Record available dimensions and their source, not an assumed acceptable distance.
• Connections: inlet flange, transition or plenum geometry; identify who provides the connection and which drawing controls it.
• Accessories: proposed screens, guards, dampers or other inlet items. Record their location and inclusion status; ask whether the quoted performance basis covers them.
• Service access: access for inspection and component removal, recorded separately from the space needed for air entry.
• Open item: describe the difference or missing information, responsible party, required response and target review date.
• Disposition: supplier response reference, accepted drawing revision and any unresolved condition. Leave unanswered items visibly open.

Support the layout review with photographs of both inlet surroundings, measured clearances and the referenced GA drawing.

Keep the performance boundary attached to the layout

Ask the supplier to identify the selected duty, configuration and inlet arrangement represented by the performance information. If the proposed site arrangement differs, submit the marked layout for review before treating the original selection as confirmation of the changed installation.

Neither an overall width nor a two-inlet description specifies an equal division of flow. Do not allocate half the total airflow to each inlet without project evidence. Likewise, a double-inlet fan is not automatically interchangeable with another series or with a single-inlet unit.

The 4-2×72 product page and 4-2×79 product page provide separate model-family references. Confirm the actual selected family, size, drive and drawing. This checklist does not transfer performance or dimensions between them.

Reopen the review when the layout changes

A relocated wall, added guard, revised inlet transition or changed platform can invalidate an earlier layout assumption. Send the revised information with both side labels, the revision change and the affected scope. Record whether the change requires revised selection data, a revised GA or further site information.

Do not remove protective devices, accept a blocked inlet or increase RPM as a shortcut to resolving the layout. The responsible project team should address performance, mechanical and safety requirements together.

Send a two-sided approval package

Provide the marked GA, separate photographs or sketches for both inlet surroundings, relevant dimensions, proposed accessories and the already selected operating duty. Include an owner for every unresolved item before requesting approval.

For the wider dimensional and connection review, use the GA drawing guide. For bearing, wheel and drive terminology, use the fan arrangement guide. This page adds the two intake-path records; it does not replace those broader checks or the project’s final engineering approval.