QIYUE FAN / INSTALLATION INTERFACES

Fan Vibration Isolator RFQ: Define the Equipment, Supports and Scope

“Include anti-vibration mounts” is not enough to compare quotations. The buyer needs a defined assembly, a support-point layout and a responsible reviewer for the proposed isolation system.

Specify the supported assembly, mounting loads and site conditions together. Final isolator selection should match the equipment and the supporting structure.

Three records that should agree

Total weight alone leaves a gap

Greenheck’s isolator guidance explains that equipment manufacturers can size isolators using weight distribution at the isolator points. For an RFQ, ask for the support-point schedule applicable to the proposed assembly rather than assuming equal loading at every corner.

Keep the weight basis explicit: what is included, whether the figure describes transport or operating condition, and which drawing revision it belongs to. If the motor, base or arrangement changes, request confirmation that the previous support information still applies. Mark unavailable values as pending; do not calculate missing loads from a photograph.

The building interface matters too

ASHRAE’s noise and vibration chapter explains that support stiffness affects isolation performance. It also identifies the need to review support-point operating loads and applicable restraint conditions. Its discussion of combined internal and external isolation warns of resonance near operating speeds and calls for experienced specialist guidance.

Translate that into a purchasing handover: identify the installation location, supporting structure, normal and intended variable-speed range, and any sensitive neighboring spaces. Ask the qualified project reviewer to state the applicable vibration, structural and restraint requirements. Do not substitute a generic spring or rubber mount description for that review.

Separate the purchase into clear responsibilities

• Equipment supplier: confirm the offered fan/motor/base arrangement, relevant assembly data and drawing revision. State which information remains provisional.
• Isolation proposal: identify who selects the mounts and supplies the support-point schedule, product references and installation documents.
• Site interface: identify who reviews the supporting structure, anchorage, required restraints and connection movement allowances.
• Installation and acceptance: name the party responsible for installation, checking against approved documents and recording acceptance. Obtain the applicable procedure rather than inventing bolt torque, clearance or adjustment values.

Identify the supplier for the mounts, base, anchors and restraints in the quotation.

Copy a mounting-scope review record

Equipment tag / quotation and GA revision:
Fan, motor, drive and base arrangement:
Weight basis / included items / operating condition:
Support-point labels and layout reference:
Support loads and source / unresolved values:
Site support structure and location:
Normal and intended variable-speed range:
Existing internal isolation or supplied base:
Applicable noise, vibration and restraint requirements:
Proposed isolator schedule and reviewer:
Mounts / base / anchors / restraints supply split:
Duct and other connection-interface reviewer:
Installation instructions and acceptance record required:
Open issues / responsible party / approval status:

Replacement mounts need identification, not guesswork

For a replacement enquiry, provide readable existing mount labels, the equipment identity, support-point photographs and available drawings. Explain what changed since the original installation. A mount that fits the same holes is not, by that fact alone, an approved replacement. Leave equivalence to the responsible technical review.

If the problem is vibration that has already developed, start with the installed-fan vibration review rather than assuming new isolators will solve it.

Close the installation-interface loop

Use the GA drawing guide to align drawing references and the flexible connector RFQ guide to clarify duct-interface responsibilities. To start a quotation review, send the equipment and mounting information; unresolved items can be identified before an option is treated as confirmed.