Vent-Axia Seminar:
Parts F and L For Ventilation 2010
Parts F and L 2010
Agenda
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Part F History
The New Structure
Design Performance
Part F Ventilation Systems
Air Permeability and Performance
Part L Main Changes and Overview
Competent Person’s Scheme
Summary and Questions
Vent-Axia Since 1936
Company Locations
The largest UK ventilation
employer
Over 800 employees 4 locations
Dudley Metals and Systems
Swindon
- Motors
Crawley Plastic Assembly
Reading –
Plastic Extrusions
History
• 1992 – Part F – Bathroom and Kitchens
needed extract rates for the first time
• 1995 – Utility rooms were added
• All rates were intermittent
• Refurbishment followed good practice
and used the same solutions
1992 -1995
Intermittent Fans
Bathroom
15l/s
(100mm)
Utility Room
30l/s
(150mm)
Added 1995
Kitchen
60l/s
(150mm)
2006
• New Part F Regulations expanded to
include intermittent and continuous
systems
• New Part L Regulations developed because
of the Energy Performance of Buildings
Directive (EPBD) in Europe
• Direct influence on product design
• SAP became the standard tool for
calculating the energy use of domestic
buildings
2006
Intermittent and
Continuous
Intermittent Fans
Passive stack
ventilation
MEV
MVHR
New Structure 2010
Legal
requirements in
the Building
Regulations and
Part F of
Schedule 1
1st Tier
2nd Tier
3nd Tier
Approved
Document
F
Domestic
Ventilation
Installation and
Commissioning
Guide
Industry, Guides,
Good practice
Guides, Codes of
practices and
standards
Both ADF and ADL refer to additional guides in the form of 2nd and 3rd tier documents
Building Regulations
• Part F
– Air-tightness –
– Tighter building mean more controlled
ventilation
– Installation –
– Tighter policing on installation as
performance becomes more critical
• Part L
– SAP
– SBEM
Tools that measure
energy efficiency with
targets to improve it
Approved Document F
Compliance
Design Performance Criteria
Means of ventilation and airflow rate based on
dwelling permeability
Installation and Commissioning
Installed performance to be achieved through
Competent Persons scheme
Operation and Maintenance
End user information to ensure effective
use and maintenance
Design Performance
• Dwelling Air
Permeability
<5m3/(h.m2)@50Pa
• Dwelling Air
Permeability
>5m3/(h.m2)@50Pa
Design Performance
• Dwelling Air Permeability <5m3/(h.m2)@50Pa
Design Performance
• Dwelling Air Permeability <5m3/(h.m2)@50Pa
Part F Ventilation Systems
Part F Ventilation Systems
System 1 Intermittent Extract Fans
Intermittent Extract Fans
Part F Ventilation Systems
System 1 Intermittent Extract Fans
All Intermittent fans are tested as installed
performance
Low Carbon motors give 80% reduction in
power consumption, 5 Year Motor
Guarantee
Suitable for Wall, Window, ceiling or ducted
applications
System 1
Background Ventilators
System 1
Background Ventilators
Window Vents in Flats
• With no cross flow
in single sided
apartments high
and low level
ventilation is
needed
• This doubles what
is already an
increased number
of vents
High Level
Low Level
Part F Ventilation Systems
System 3 MEV
Decentralised MEV
Centralised MEV
Part F Ventilation Systems
System 4 MVHR
Mechanical Ventilation with Heat Recovery
(MVHR)
Counter Flow Heat Exchanger
OUTSIDE
Exhaust temp’ is 2 degrees
90%+ Efficiency
Internal temp’ 20 degrees
INSIDE
Counter Flow Heat Exchanger
OUTSIDE
External ambient 0
degrees
Exhaust temp’ is 2 degrees
90%+ Efficiency
Supply temp’ is 18 degrees
Internal temp’ 20 degrees
INSIDE
System 4
(MVHR Range)
MVHR units should be SAP
Appendix Q Listed
Easy access filters for
annual maintenance.
Top performing MVHR SAP Q
product will help with
compliance
100% Speed Control for
accurate site commissioning
Various models to meet
project requirements
Compact and light weight
User and Contractor friendly
controls
Automatic Integral control
options
Noise
• Continuous Mechanical
ventilation systems
should be below 35dBA
on trickle speed
Main Changes - 2010 Edition
• Ventilation will become a
controlled service needing
sign off by a “competent
person”
• 2nd tier “Domestic
Ventilation Installation and
Commissioning Guide” with a
sign off sheet
• All ventilation systems shall
be commissioned (including
Intermittent Fans and Cooker
Hoods)
• Commissioning checklist to
be passed to Building Control
Competent Persons Scheme
• BPEC’s Domestic
Ventilation Systems 2010
has been running since
May 2011
• Recognised by all
competent person schemes
• Delivered by
manufacturers, colleges
and independent trainers
BPEC Training
• SAP software now includes
drop-down box asking
whether the system has
been installed by an
approved installer
Domestic Ventilation Compliance Guide
3 Part Sign-Off
Information for the Occupier
The owner/occupier shall be
given sufficient information
about the ventilation system
and its maintenance
requirements so that the
ventilation system can be
operated to provide
adequate air flow. This
should apply to natural and
mechanical systems in new
dwellings
Approved Document L
Part L – Energy Efficiency
• The Target Emission Rate (TER) for 2010 is 25%
improvement over 2006
• SAP Q process is retained
• New second tier documents in the form of
Building Services Compliance Guides for domestic
and non-domestic
• These highlight specific performance levels in
regard of ventilation
SAP 2009
• CO2 factor changed
– 0.42 to 0.51
• Reduced specific fan power
the important factor
• Potential to reduce
conservative ratings if
installed by a competent
person
Effect of System Selection in SAP
Air Permeability Rate (m³h/m2 at 50 Pa)
Treatment of Ventilation Systems in SAP
DER (Dwelling C02 Emission Rate)
23
22
Nat Vent
21
MEV*
20
MVHR**
Default
MEV
Default
MVHR
19
18
17
16
15
2
3
4
5
6
7
* Used best SFP of 0.18w/l/s for Kitchen + 1 wet room
** Used best SFP/HX eff combination of 0.46w/l/s & 91% for Kitchen + 1 wet room
Based on 89m2 Gas Heated Semi Detached dwelling with a TER of 23.00kg.Co2/m2.Yr
Part L1 - Domestic
Part L and Solar Gain
• Criterion 3 – Limiting the
Effects of Solar Gain
• 4.25 – If ventilation is provided
using a balanced system,
consideration should be given
to providing a summer bypass
function during warm weather
so that the ventilation is more
effective in reducing
overheating.
Part L1 Summary
Important Features of Part L
• TER 25% improvement over 2006
• SAP Q is retained
• Minimum Specific Fan Power across
ventilation systems
• MVHR efficiency no less that 70%
Vent-Axia Seminar:
Parts F and L for Ventilation
2010
Thank you for your attention
Questions?