Air handling units (AHU) in Kent

An air handling unit (AHU) is the central plant that filters, moves and often heats, cools or recovers heat from the air for a building's ventilation system. We replace ageing units, upgrade fans and controls, and service AHUs so they keep delivering their design airflows.

If you are anywhere in Kent, send the postcode and a few photos and we will tell you what we would recommend. Towns we cover include Maidstone, Gillingham, Chatham, Royal Tunbridge Wells and Folkestone.

Air handling units in Kent at a glance

Area: Kent
Towns listed: 32, largest Maidstone
Postcode districts: DA3, DA4, DA3, DA4, DA9 and DA10
Price region: South East
Survey: Free survey (UK mainland)

What air handling units (AHU) involves

Many AHUs in older offices, schools and retail units run on belt-driven fans, clogged filters and controls nobody understands. Replacing the fan section with EC fans, or the whole unit with a modern heat recovery AHU, can cut running costs and noise while restoring airflow. New units must meet current ecodesign rules for fan efficiency and heat recovery.

Like-for-like replacement

New unit in the same position, connected to existing ductwork.

EC fan retrofit

Belt-driven fans replaced with direct-drive EC fans.

Controls upgrade

New controls, sensors and BMS integration.

Guide prices in Kent

Air handling units (AHU) guide prices in Kent
Work	Guide price
Air handling unit replacement, small to medium unit, like-for-like position (per unit)	£10,950–£38,450 + VAT
Air handling unit service: filters, belts or EC fan check, coils, controls (per unit per visit)	£215–£435 + VAT

Guide prices using South East rates. Prices exclude VAT. A guide price is not a quote: we confirm a fixed price in writing first.

Signs it is time to call us

Corroded casings or leaking drain trays
Rooms that no longer get enough air
Rising energy bills from old plant

Rules in England

In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). Workplaces must also be ventilated with a sufficient quantity of fresh or purified air under the Workplace (Health, Safety and Welfare) Regulations 1992.

How the job runs

Survey
Options
Plan
Install
Commission

Towns we cover in Kent

Questions about air handling units (AHU) in Kent

Is the survey free in Kent?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.

How often should an AHU be serviced?

Most AHUs need servicing at least twice a year, with filters changed more often in dirty environments. SFG20 schedules are commonly used to set frequencies.

Is it worth replacing belt-driven fans with EC fans?

Often yes. EC fans are usually more efficient, quieter and need no belt changes, and the retrofit can cost much less than a new unit.

Which rules apply to ventilation in Kent?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Which towns in Kent do you cover?

All of Kent, including Maidstone, Gillingham, Chatham, Royal Tunbridge Wells and Folkestone. If your town is not listed, send the postcode and we will confirm.