Vent-Axia Seminar:Parts F and L For Ventilation 2010

Agenda• 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

Parts F and L 2010

Vent-Axia Since 1936

Company Locations

Dudley -

Metals and Systems

Crawley -

Plastic Assembly

Swindon - Motors

The largest UK ventilation employer

Over 800 employees 4 locations

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 Room30l/s

(150mm)Added 1995

Kitchen60l/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 FansPassive stack

ventilationMEV MVHR

New Structure 2010

Legal requirements in

the Building Regulations and

Part F of Schedule 1

1st Tier

ApprovedDocument

F

2nd Tier

Domestic Ventilation

Installation and Commissioning

Guide

3nd Tier

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 CriteriaMeans of ventilation and airflow rate based on dwelling permeability

Installation and CommissioningInstalled performance to be achieved through Competent Persons scheme

Operation and MaintenanceEnd 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 SystemsSystem 1 Intermittent Extract Fans

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

Part F Ventilation SystemsSystem 1 Intermittent Extract Fans

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 SystemsSystem 3 MEV

Decentralised MEV

Centralised MEV

Part F Ventilation SystemsSystem 4 MVHR

Mechanical Ventilation with Heat Recovery (MVHR)

Counter Flow Heat Exchanger

Internal temp’ 20 degrees

Exhaust temp’ is 2 degrees

OUTSIDE

INSIDE

90%+ Efficiency

External ambient 0 degrees

Internal temp’ 20 degrees

Exhaust temp’ is 2 degrees

Supply temp’ is 18 degrees

OUTSIDE

INSIDE

90%+ Efficiency

Counter Flow Heat Exchanger

System 4 (MVHR Range)

MVHR units should be SAP Appendix Q Listed

Top performing MVHR SAP Q product will help with compliance

Various models to meet project requirements

Compact and light weight

Easy access filters for annual maintenance.

100% Speed Control for accurate site commissioning

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 Guide3 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

* 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

Treatment of Ventilation Systems in SAP

15

16

17

18

19

20

21

22

23

2 3 4 5 6 7

DER

(Dw

ellin

g C0

2 Em

issi

on R

ate)

Nat Vent

MEV*

MVHR**

DefaultMEV DefaultMVHR

Air Permeability Rate (m³h/m2 at 50 Pa)

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 SummaryImportant 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 2010Thank you for your attention

Questions?