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Calculators and quote builders

Free tools for mine ventilation engineers, estimators and builders. Work out loads, weights and costs, then send the result to us for a quote.

1974 Fabricating in the Hunter since

ISO 9001 Certified quality system

AS/NZS 5131 Certified structural steelwork

100% Australian owned and operated

Pick a tool

Each tool can email you a PDF of the result or pass it straight to our team for pricing.

Build a list of airlocks, overcasts, regulators, doors and seals, and send it for a quote.

Work out the load on a door or regulator opening from its size and design pressure.

Put a yearly dollar figure on air leaking through stoppings, doors and regulators.

Seven quick questions to find the right service for your stairs, rails, gates or custom steel.

Estimate the weight of plate, bar, hollow sections, beams and channels for a cut list.

Your figures Every result comes from the figures you enter. We don’t assume loads, leakage rates or prices.

Published data Steel weights use 7,850 kg/m³ and InfraBuild’s published section masses.

Engineer checked Every rated ventilation device we build is certified by our engineer.

Send for a quote Send any result to us and it arrives with your answers already filled in.

Send your drawings and we’ll come back with a price. No project is too large or too small. Call 02 4964 8270 or email sales@ghfabrications.com.au.