Ventilation, Air Filtration & Dehumidification in Kamakis, Ruiru & Kiambu County

Problems We Solve

Symptom	Usual cause	What we do
Stuffy or hot room even with the AC on	No fresh-air supply, recirculated air with heat and carbon dioxide building up	Add a filtered fresh-air supply and balance it with extraction
Kitchen smoke or grease smell reaches the dining area	Extractor too small or starved of make-up air, dirty filters and ducts	Resize the canopy and fan, add make-up air, clean or replace filters, re-route ducting
Condensation on walls and windows, black mould	Humid air trapped with no extraction, cold surfaces	Extract at wet areas, add a dehumidifier, improve air movement
Dust on machines, stock or products	Poor filtration, unsealed openings, no controlled air supply	Filtered supply air, local dust extraction and upgraded filters
Damp smell in stores, basements or archives	Low air movement and high humidity	Dehumidifier with drain, plus mechanical ventilation
Heat and fumes from workshop processes	No local exhaust at the source	Local extraction hoods and roof extractors
Smelly toilets and washrooms	Weak or missing extract, ducts not reaching outside	Inline extractors ducted to outside

 

How Much Ventilation Does a Space Need?

Ventilation is sized by air changes per hour (ACH): how many times the room’s air is replaced in an hour. Typical design ranges are below. They are a starting point only, because heat, fumes and occupancy change the answer.

Space	Typical ACH	Notes
Offices and meeting rooms	4–8	Higher where crowded
Restaurants and dining areas	8–12	Higher with smoking or high occupancy
Commercial kitchens	15–30	Depends on canopy size and cooking equipment
Workshops and light industrial	6–20	Driven by heat and fume sources
Toilets and washrooms	8–15	Continuous extract to outside

 

Choosing the Right Filter

Filter stage	What it captures	Typical use
Coarse (G4)	Larger dust, lint and insects	First stage, protects coils and fans
Fine (F7–F9)	Fine dust, pollen and some smoke	Offices, clinics, clean manufacturing
HEPA (H13–H14)	Very fine particles and airborne bacteria	Laboratories, theatres, clean rooms
Activated carbon	Odours and some gases	Kitchens, waste rooms, laboratories

 

Dehumidification

Indoor humidity of about 40–60% is comfortable and keeps mould down. Above that, damp stores, basement offices and archives start to smell, and stock and paper suffer. Refrigerant dehumidifiers work well in warm, humid spaces. Desiccant units suit cooler spaces and low-humidity targets. We size by moisture load and make sure the unit has a proper drain.

Our Process

1. Survey and measurement. We measure the space, note the heat, smoke, dust or damp sources, and record how it is used.
2. Airflow design. We size fans, ducts and filters from the required air changes and the pressure the system must overcome.
3. Ductwork, hoods and fittings are made in our Kamakis workshop to the building’s dimensions.
4. Fans, ducts, dampers and filters are installed, supported and sealed, with electrical supply and controls.
5. Balancing and testing. We measure airflow at the points that matter and adjust dampers until the design is met.
6. Handover and filter schedule. You receive a filter-change schedule and a record of the settings, and can take a service plan.

 

Who We Serve

Restaurants, hotels and canteens; factories and workshops in Tatu City and Thika; clinics and schools; offices with basement or windowless spaces; and stores holding stock that is sensitive to damp or dust. Our Mechanical Engineering & Fabrication team can also build supports, platforms and steel work around the equipment, and we supply fans and filters through Industrial & Technical Supplies.

Shred Designs tip If kitchen smoke drifts back into the dining area even with the extractor running, the cause is often missing make-up air. A powerful extractor cannot pull air out of a room that is not letting air in.

 

Related services

• Commercial & Industrial HVAC
• AC Installation
• HVAC Maintenance Contracts
• Mechanical Engineering & Fabrication
• Industrial & Technical Supplies
• All HVAC Installation & Repair services

 

Frequently Asked Questions

Do I need ventilation if I already have air conditioning?

Yes. A standard split AC recirculates room air and does not bring in fresh air. In crowded rooms, kitchens and sealed spaces, air quality drops even while the room feels cool.

How many extractor fans does my kitchen need?

It depends on the cooking equipment, canopy size and ceiling height. We size by air volume and make sure make-up air is provided, rather than counting fans.

Do you fabricate ductwork?

Yes. We make ducting, hoods and fittings in our Kamakis workshop, in galvanised steel or to your specification.

What filter class do I need?

Coarse filters protect equipment, fine filters suit offices and clinics, and HEPA is for clean rooms, theatres and laboratories. We recommend by use, not by the highest number.

Will a dehumidifier stop mould?

It helps a lot when humidity is the cause, but mould also needs the damp source fixed, such as leaks and poor drainage. We check both.

How often should filters be changed?

It depends on the dust load. Coarse filters in a dusty workshop may need checking monthly, while fine filters in an office may last several months. We set a schedule at handover.

 

Request a ventilation survey Tell us what the space is used for and what the problem is, and we will arrange a visit. Request a quote   |   Call 0704 879 675   |   info@shreddesigns.co.ke Shred Designs Limited, Pemwa Building, Kamakis, along Eastern Bypass