Retrofitting: extending the life of fan boxes without replacing them

Retrofitting means upgrading existing equipment or an existing installation with new components instead of replacing it entirely. If the structure is still sound, you change only what has worn out, become obsolete or needs adapting to new requirements.

It is common practice in industry and construction, and it is becoming increasingly important in ventilation and HVAC. On a fan box, retrofitting can mean changing the motor, adding a variable frequency drive, replacing the fan or improving the insulation, while keeping the casing and connections that already work.

Why does it make so much sense now?

Three factors are pushing in the same direction:

• Cost. Repairing and upgrading is usually cheaper than buying new equipment and installing it all over again.
• Energy efficiency. Regulatory requirements keep getting tighter. Adding a variable frequency drive or a more efficient motor brings an installation up to date without starting from scratch.
• Sustainability. Extending a unit's service life means less waste and fewer new materials. It is the circular economy applied to everyday site work.

There is also a very practical factor: fan boxes are usually on roofs, in courtyards or above false ceilings. Replacing a whole unit can mean dismantling ductwork, moving bulky equipment and shutting the kitchen down for longer than necessary.

Since 1997 we have designed and manufactured our own fan boxes, following one clear principle: anything that can wear out must be replaceable. That is why our boxes can be dismantled and have removable access panels.

A good example is the UNIC box, designed for smoke extraction and fitted with a fan certified to 400 °C/2 h:

• All panels are removable, so you can reach the inside without dismantling the box.
• The profile frame can also be dismantled.
• The motor sits on a tensioning base, with a belt drive and two-piece pulleys that are easy to replace.

This design makes the three pillars of retrofitting possible:

• Spare parts: replace only the part that has failed, not the whole unit.
• Maintenance: clean and inspect the inside quickly and thoroughly, which is essential in kitchen extraction.
• New lives: adapt the box when needs change, for example when a kitchen expands or when new regulations come into force.

A demountable box only makes sense if spare parts are available afterwards. That is why we supply all the essential components separately: motors, belts, pulleys, tensioning bases, anti-vibration mounts, supports, flexible connectors, filters, acoustic and thermal insulation, and emergency stop switches.

Our customers are installers, and we designed this approach with them in mind:

• Less time on site. Reaching components without dismantling the installation shortens every job.
• More competitive quotes. Replacing one part instead of a whole unit lets you offer the end customer a more affordable solution.
• An ongoing service. Maintenance and upgrades become a long-term relationship with the customer, not a one-off job.
• A single point of contact. The box, the spare parts and the technical advice all come from the same place.
• A sustainability argument. Extending equipment life and reducing waste is something end customers understand and value.

Retrofitting examples on a fan box

• Adding a variable frequency drive to regulate airflow and fine-tune energy use.
• Replacing the motor when extraction needs change, with our technical team validating the selection.
• Renewing belts, pulleys and anti-vibration mounts to restore performance and reduce vibration and noise.
• Improving the thermal and acoustic insulation of a box located in a noise-sensitive area.
• Adding accessories such as rain hoods or filters to adapt the box to a new location or a new use.

At Morgui we believe a fan box shouldn't be thrown away just because one part has reached the end of its life. We design boxes that can be opened, repaired and upgraded, and we guarantee their spare parts.

Do you have an installation that needs updating? Talk to our technical team at consulta@morgui.com or on +34 93 460 75 75, and we'll help you find the retrofitting solution that suits it best.