Product · Consumer Appliances
Ceiling Fan
Bottom Cover.
Die cast aluminium bottom covers for ceiling fans — matched to top cover geometry, with canopy mounting features and decorative visible surfaces produced directly from the die without secondary machining.
Product Overview
Ceiling Fan Bottom Cover
The ceiling fan bottom cover (canopy cover) closes the motor housing assembly and forms the lower visible face of the fan. Its geometry must mate precisely with the top cover and motor housing, and it presents a decorated surface visible from below — making surface quality as important as dimensional accuracy.
SAPL produces bottom covers on 180T HPDC machines using ADC12 alloy. The die is designed to produce the primary mating faces and fastener boss holes in one shot, eliminating secondary drilling operations. Parting line placement is managed to keep witness marks off the visible lower face.
Bottom covers are supplied as cast, CNC-drilled, and powder coated in a customer-specified colour. Where assembly screws are specified, SAPL can provide tapping of boss holes as part of the machining sequence. All bottom covers are matched to the corresponding top cover programme and controlled under the same quality plan.
Quality
Critical quality requirements
These are the characteristics SAPL controls and measures on every production batch for this component — and how they are maintained in the process.
Mating face accuracy
The mating faces must seat flush against the motor housing and top cover. Flatness of ±0.3 mm over the mating diameter is maintained through die design and in-process dimensional gauging.
Surface cosmetics
Cold shuts, sink marks, and flow lines on the visible lower face are rejectable. Die temperature monitoring and injection speed profiling ensure consistent surface quality run to run.
Fastener boss integrity
Tapped boss holes must not show thread tear-out under the specified torque. Boss wall thickness is validated at the tooling approval stage via cross-section samples.
FAQ
Common questions
Questions from procurement teams and design engineers about this component.
Ask a technical question →Are ceiling fan bottom covers supplied matched to specific top cover designs?
Yes. Bottom covers are developed and controlled as part of the specific fan assembly programme. Die design, quality plan, and colour specification are aligned to the top cover and housing components produced by SAPL under the same programme.
Can SAPL tap the boss holes in the bottom cover?
Yes. Tapping of M4 and M5 boss holes is included in SAPL's CNC machining sequence. The tapped holes are go/no-go gauged in-line to confirm thread quality before the coating operation.
What powder coat colours are available?
SAPL can apply powder coat in any customer-specified RAL colour or custom colour match. The powder coating is applied over a nano-ceramic pre-treatment that provides excellent adhesion on ADC12 substrate.
Capabilities
Processes used for this component
High Pressure Die Casting
Five fully-automatic HPDC machines from 180T to 450T.
View capability →CNC & VMC Machining
Over 20 CNC turning centres and Vertical Machining Centres — including 4th-axis VMC for complex geometries.
View capability →Powder Coating
5-tank nano-ceramic pre-treatment, two dedicated coating booths, 100% Dry Film Thickness inspection on every part.
View capability →Related Products
Other components in this programme
Ceiling Fan Top Cover
High-pressure die cast aluminium top covers for ceiling fans — precision blade-arm bosses, clean visible surfaces, and consistent dimensional accuracy across high-volume production runs.
Fan Motor Housing
High-pressure die cast aluminium motor housings for ceiling and exhaust fans — precision bearing seat bores, stator fit diameter, and integral ventilation geometry produced in one casting with post-cast CNC machining.
Get Started
Sourcing ceiling fan bottom cover?
Share your drawings — STEP, IGES, DXF, or PDF. SAPL will review manufacturability, confirm alloy and process, and respond with a technical and commercial proposal within 72 hours.