Custom build - make to order
Every fan on this page started as a drawing. This is the route for the duties that do not sit in a catalogue slot: unusual gas, unusual space, unusual material, or an existing foundation that has to be reused.
Illustrative 3D render of a representative custom build; geometry follows the approved GA drawing for your order.
Ranges are the family envelope our own product pages publish. The order always confirms against an approved GA drawing with the duty point, speed and absorbed power for your installation.
How it works
Make-to-order is not a polite way of saying “we will try”. It is a sequence. Duty review, selection, general arrangement drawing, your approval, manufacture, test, dispatch. The published capability for this route is 100 m3/hr to 2,00,000 m3/hr, 25 to 1,900 mmWC with 2,000 mmWC reachable, impellers from 300 to 2,000 mm, speeds 300 to 4,000 RPM, motors from 0.25 HP to 475 HP with above 500 HP available, and gas from ambient to 650 C.
That last number matters more than the rest, because the moment a duty leaves the standard families the conversation becomes about material, growth, bearing isolation and testing – and those are all decided on paper before the plate is cut.
We restate your numbers back to you at the actual gas density. If they do not survive the correction, that is the first thing we tell you.
Two or three options with absorbed power, tip speed and a wear statement – including the catalogue fan if it genuinely fits.
Dimensions, rotation, foundation loads, weight, centre of gravity, absorbed power. You sign this before metal is cut.
Material certificates, balance, run and performance test to IS 4894, then packing and despatch documentation.
When to use it
Delivery
Our published lead times for this route are 5 to 7 weeks for standard-scope builds and 8 to 12 weeks where material grade, impeller size or documentation load requires it. The number on your order confirmation is the one we plan against; shutdown windows and despatch milestones are put on the same sheet.
Range
| Parameter | Make-To-Order Blower | Backward Curved Blower | High Temperature Plug Blower |
|---|---|---|---|
| Airflow | 100 to 2,00,000 m3/hr published capability; higher volumes by design | 14,000 to 7,50,000 CMH | 100 to 15,000 CMH published; other sizes to the duty |
| Static pressure | 25 to 1,900 mmWC, up to 2,000 mmWC | 40 to 2,000 mmWC | 10 to 200 mmWC published; higher pressures by arrangement |
| Gas temperature | Ambient to 650 C | Up to 200 C | Tiers: to 150 C, 150-250, 250-350, 350-500, 500-650 C |
| Impeller / frame | Impeller 300 to 2,000 mm | Impeller 250 to 2,200 mm (range-wide) | Impeller 250 to 2,200 mm (range-wide) |
Blank cells mean the figure is not published for that family — ask us and we will confirm it against your duty.
Questions
Flow, pressure and gas temperature. If those three exist and the density basis is normal, we can select. Everything else – arrangement, material, documentation – is a conversation we can have on a call.
No. Client GA drawings are their property. We can show you representative geometry, published envelope figures and the test and documentation set we issue.
IS 4894 is the standard test basis for our centrifugal fans. Where a project requires a certified laboratory rating to ISO 5801 or ANSI-AMCA 210, that is scoped and priced as a test programme, not assumed.
Export orders with packing, marking and documentation to destination requirements are part of the published scope. Talk to the desk early – material certification and test sequencing change the lead time.
Airflow and pressure are always quoted at the actual gas density. Altitude, temperature and duct losses move the number — run it through the worksheet before you send it.
Straight-through air at low pressure: tube axial, vane axial and propeller builds in mild steel and aluminium.
High static efficiency, non-overloading power curve. The default wheel for clean and lightly loaded air at medium to high pressure.
Flat plates set at an angle: robust, tolerant of moderate dust, still efficient and still non-overloading.
Enquiry
Tell us the duty and the constraints. You get a selection, a build sheet and a price from the works — not a call centre.
