Foundry & Furnace Heat Extraction

Moving air that is genuinely hot — furnace, kiln and casting hall extraction where the temperature of the airstream, not its volume, decides what equipment survives.

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  • 5equipment groups

WhatExtraction where the air is the hazard

Foundry ventilation covers furnace and ladle extraction, casting and pouring bay hoods, cooling line extraction, and general hall ventilation to keep the working environment survivable. What sets it apart is airstream temperature: furnace extract can run several hundred degrees, and general hall air is far above ambient all year.

WhoWho buys it

Iron, steel and non-ferrous foundries, forging plants, heat treatment shops, glass and ceramics producers, and the refractory and plant contractors who build for them.

WhyWhy temperature governs the selection

Heat attacks a fan in several ways at once. Bearing grease degrades and bearings fail early; motor insulation ages; the impeller expands and can foul the housing; and the air itself is far less dense, so a fan moving the same volume delivers substantially less mass and develops less pressure than its ambient rating implies. A fan chosen on volume alone will both underperform and fail early.

HowSelecting for the actual airstream temperature

Establish the airstream temperature at the fan — not at the furnace, since dilution air upstream may have cooled it usefully. De-rate the fan for air density at that temperature; ignoring this is why hot systems commonly under-deliver. Then choose construction to match: shaft coolers, heat slingers or bearings mounted outside the airstream, and high-temperature materials. Finally consider recovery: foundry extract carries enormous energy, and recovering even part of it changes the plant’s energy position.

Equipment this application needs

Centrifugal Fans Furnace & hood extract Centrifugal Fans813 High-temperature construction with bearings isolated from the hot airstream. Axial Flow Fans Hall & roof ventilation Axial Flow Fans752 Large-volume hot air removal from the casting hall roof. Radial Fans Particulate-laden hot gas Radial Fans288 Where the extract carries sand, scale or fettling dust as well as heat. Heat Exchangers Heat recovery Heat Exchangers364 The extract stream carries far more energy than the plant’s heating demand — recovery is normally the fastest payback available. Industrial Fans Operator spot cooling Industrial Fans273 Directed airflow at working positions; in a casting hall this is a safety measure.

What to check before you order

High Temperature 369
The defining specification. Establish the temperature at the fan, not at the source.
Industrial Grade 1,636
Heavy continuous duty with serviceable bearings.
Corrosion Resistant 266
Combustion products and flux fumes are aggressive once cooled.
Heat Recovery 94
Recovering extract heat is normally the largest single saving available in a foundry.
380V 2,141
Three-phase for extraction plant of this scale.

Products for this application

Questions buyers ask

Why does a fan move less air when the air is hot?
It does not move less volume — it moves less mass, because hot air is less dense. A fan is a volume machine, so at 300 °C it develops roughly half the pressure it would at ambient and its motor draws correspondingly less power. If the duty was calculated on mass flow or on ambient-rated pressure, the installed system will fall short. De-rating for density at the operating temperature is essential.
How are bearings protected in high-temperature fans?
By keeping them out of the hot airstream. Common arrangements mount the bearings outside the casing on an extended shaft, fit a heat slinger between impeller and bearing to dump conducted heat, or use forced shaft cooling. Simply specifying high-temperature grease in a standard arrangement is what leads to repeated early failures.
Is heat recovery worth it on foundry extract?
Usually yes, and it is often the fastest payback in the plant, because the extract stream carries far more energy than the building’s entire heating demand. The engineering question is fouling: the recovery surface has to tolerate whatever particulate the extract carries and stay cleanable.

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