2. Draught Finder Trevor Clark 10. Available Ventilation System Types
Qualified L1
Air Tester & Thermographer
Affiliate Member BINDT
(British Institute of Non Destructive Testing)
Independent Airtightness Testing Scheme
UK Thermography Association

3. Available Ventilation System Types
This presentation is intended to provide a brief indication of the types of ventilation systems available.
VENTILATION is the CONTROLLED entry or exit of air!
Air Leakage allows UNCONTROLLED entry or exit of air!
Uncontrolled Air Leakage
(Draughts)
= Higher Energy Bills
An Airtight building MUST have sufficient ventilation.
The risks of under provision of ventilation include
Building Damage
POOR AIR QUALITY
CONDENSATION
Leading to mould growth with potentially serious HEALTH issues

4. Available Ventilation System Types
This presentation is intended to provide a brief indication of the types of ventilation systems available.
Ventilation – A Note
If you live in an existing property and intend on improving the energy efficiency of your home to reduce your fuel bills and save money, please find out how tightly sealed your home is before starting any air sealing work.
Knowing how air tight your home is will provide some guidance as to how much sealing work you can do before you need to consider upgrading to a fully controlled mechanical ventilation system to avoid condensation & possible health problems later on.
There is no one fix for all properties, the ventilation system needs to be designed for your property. The main problem for ventilation is understanding just how the occupants actually use the building.
Occupants can inadvertently dramatically increase the amount of water vapour held in the air in the building just by how they use their home.
If not already viewed, please see our slide show on “Draughts v Ventilation”

5. We will be concentrating on “Mechanical Ventilation” systems
Available Ventilation System Types
BASIC Ventilation
There are many routes and means of ventilation.
Passive ventilation works with air bricks, trickle vents, gaps in floor boards and around window and door openings. (Uncontrolled and wasting energy)
Active (controlled) includes;
Mechanical extractor fans
Air exchange units
Including heat recovery, (energy saving)
Positive Pressure units.
Depending on the structure and layout several types of active and passive ventilation may be required to achieve effective performance.
We will be concentrating on “Mechanical Ventilation” systems

6. Ventilation is required to remove moist air while providing fresh air
Available Ventilation System Types
Ventilation is required to remove moist air while providing fresh air
BASIC Ventilation

7. Each adult expires 2.25 litres by breathing alone
Available Ventilation System Types
BASIC Ventilation
Condensation is not a new phenomenon but in many ways it is exacerbated by modern living in houses which were built and designed for an earlier generation.
But where does all the water come from;
per Bath litres
per Shower litres
5 average sized plants 0.4 litres
Cooking (3 meals) litres
Cooking on Gas stove 1.5 litres
Floor Washing litres
Drying Clothes litres
7 Kg Clothes - Tumbled Dried 9.0 litres
4 occupants – Adults 9.0 litres
Each adult expires 2.25 litres by breathing alone
Any physical activity increases this figure. 
That’s 25 litres per DAY
Excess Moisture is
BAD for our health
& BAD for our buildings

8. Available Ventilation System Types
BASIC Ventilation
Ventilation may be achieved by one or a combination of the following systems, but please take advice from a ventilation specialist before installing any system.
Ventilation System
System
Cost
Pro's
Con's
Control ?
Passive
Relies on either natural wind pressure driven by weather externally and temperature inside.
Very Low
Easy as building comes with gaps!
High Energy Waste
None
Natural
Allow temperature to encourage air flow through the building
Very low

9. Available Ventilation System Types
BASIC MECHANICAL Ventilation
Individual Fans
Mechanical Ventilation
System
Cost
Pro’s
Con’s
Control
Individual Fans
Installed in Window or Wall, short or long ducts may be required
Low
Easy to install
Can be controlled
Can be noisy
Wastes the Energy in stale air
Cost money to run
High Energy bills unless controlled
Various
Timer
Thermostat
Humidistat
Basic Extract …..
to stand alone heat recovery fans

10. Positive Input Ventilation Fans
Available Ventilation System Types
POSITIVE INPUT Ventilation
Ventilation System
System
Cost
Pro's
Con's
Control ?
Positive Input Ventilation
Serves the whole house, with one input & short duct
Low to Med
Easy to install
Can be controlled
Additional Heating element for winter
Wastes the Energy in stale air
Cost money to run
Additional heater increases energy costs
High Energy bills
Risk of increased interstitial condensation
Annual maintenance required for optimum performance
Various
Timer
Thermostat
Humidistat
Positive Input Ventilation Fans

11. NOT ventilation, but can help control condensation
Available Ventilation System Types
NOT ventilation, but can help control condensation
DEHUMIDIFIER
Ventilation System
System
Cost
Pro's
Con's
Control ?
Dehumidifier
NOT ventilation but can help control condensation
Serves single room
Med
Reasonably priced
Range of sizes
Free Standing
“Fixed” models easy to install
Can add heat to room
Reasonable cost to run
Filters air
Removes moisture from the air.
Single room only
Small water capacity
Does not bring in fresh air
Circulates stale air
Various
Timer
Thermostat
Humidistat
Dehumidifiers

12. Available Ventilation System Types
WHOLE HOUSE Ventilation – Balanced Flow
Ventilation System
System
Cost
Pro's
Con's
Control ?
Balanced Flow & Whole House Ventilation
Supply & Exhaust ducting required
Med to High
Humidity control.
Temperature control.
Timer control.
Can add heat to all rooms.
Filters air.
Serves whole house.
Fresh air input.
Removes stale air.
Requires engineer to design system.
Increase in price.
Fixed in place.
Requires professional installation.
Medium to high running costs.
Annual maintenance required for optimum performance
Various
Timer
Thermostat
Humidistat

13. Available Ventilation System Types
i) HEAT RECOVERY Ventilation
Ventilation System
System
Cost
Pro's
Con's
Control ?
i) Heat Recovery Ventilation
Heat Plate Exchange Energy Recovery
Between 70 to 95% Efficient
Ducting required as in Whole House
High
Can add heat to all rooms.
Filters air.
Serves whole house.
Fresh air input.
Removes stale air.
Low running costs.
Requires engineer to design system.
Increase in price.
Fixed in place.
Requires professional installation.
Annual maintenance required for optimum performance
Various
Timer
Thermostat
Humidistat

14. Available Ventilation System Types
ii) HEAT PUMP RECOVERY Ventilation
Ventilation System
System
Cost
Pro's
Con's
Control ?
ii) Heat Pump Recovery Ventilation
Mechanical Refrigeration System Heat Energy Recovery
From 300 to 500% Efficient
Ducting required as in Whole House
Very High
Can add heat to all rooms.
Filters air.
Serves whole house.
Fresh air input.
Removes stale air.
Very Low running costs.
Can cool in summer
Requires engineer to design system.
Increase in price.
Fixed in place.
Requires professional installation.
Can be high running costs in summer.
Annual maintenance required for optimum performance
Various
Timer
Thermostat
Humidistat

15. Available Ventilation System Types
There is an old adage which says "You pay your money & get what you paid for" & in the case of ventilation & energy efficiency this is so true!
There is so much energy in the stale air that is expelled from the internal house volume that could be used to heat water or other areas of the house. This re-use of energy that would otherwise be wasted will become the next target for energy saving measures in the modern homes of the future.
Condensation & Mould
As far as Condensation Control is concerned the only way to prevent condensation is to ventilate the room area with "dryer air" & remove the moisture loaded air from the building.
Treating any mould of fungal growths to ensure that health problems are not exacerbated should the condensation ever return.
Spores from these two items can re-immerge when conditions are 'ripe' again!

16. Trevor Clark Available Ventilation System Types
If you are experiencing any of the problems in the previous slides, please call TREVOR for an informal discussion on how we can help with condensation problems or to reduce your heating costs
Mob:
Trevor Clark
Qualified Air Tester & Thermographer
Thank you for reading …. Check out our other Slide Presentations in this series