Retrotec Blower Door Bedienungsanleitung PDF herunterladen (Seite 86)

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Term

Definition

enclosure

A room, house, or building. For rooms or interior spaces, the enclosure is the surface bounding a volume which

is connected to outdoors directly. For example in an apartment whose only access to outdoors was through a

doorway that leads directly outdoors, the enclosure is formed by the walls of the apartment. If a building has a

series of apartments or offices whose only access to the outdoors is through a common hallway then the

enclosure would be the volume that bounds all of the apartments or offices.

Envelope

The surfaces composed of floor and walls and floors that separate the test volume from volume surrounding the

test volume. Also see” enclosure”

EqLA

See “Equivalent Leakage Area”

Equivalent Leakage Area

(ELA or EqLA)

In layman’s terms, the ELA is the size of hole we’d have if all the building’s cracks and holes could somehow be

brought together. In Engineer’s terms: the equivalent size of hole required in a flat plate to give the same flow

rate having a discharge coefficient of 0.61 and taken at the Reference Pressure.

This ELA is sometimes called the EqLA or Canadian ELA because it was first used in the Canadian GSB air leakage

standard for houses. This ELA enjoys worldwide acceptance by most testers, even in the US.

This ELA should not be confused with another ELA that is often called the EfLA or Effective Leakage Area. It is

very unfortunate that both these ELA’s have the same acronym of ELA. The EfLA was developed for the US

ASTM Standard and is smaller than the EqLA by at least a factor of 0.61 because it uses a discharge coefficient of

1.0. This EfLA is sometimes called the LBL or Lawrence Berkley Labs ELA because it was developed there and is

used in the LBL natural air change model that enjoys wide usage- apart from that usage, the EfLA is not used

very much but the existence of both can create discrepancies in results that may confuse users.

When it is taken at a reference pressure of 75 Pa, it is often referred to as EqLA75. EqLA is typically about twice

the size of an Effective Leakage Area that describes the same air flow rate. See ASTM E779-10, eq. (5).

Fan Pressure

The pressure difference between inside the door fan and the surrounding air. This pressure can be read as

“PrB” from Channel B on the DM-2. It is used by the computer to calculate the air flow rate through the Door

Fan.

HVAC

Heating Ventilating and Air conditioning system.

induced pressure

The pressure difference created by the Door Fan (Test Fan) between inside and outside of the enclosure. This

pressure is commonly measured on Channel A of the pressure gauge.

Leakage

A general term used to describe holes or the area of holes in or around an enclosure

Leakage Area

This is the same as “Equivalent Leakage Area” but is not specific as to which kind of leakage

Open Range

A Range configuration on a Retrotec Door Fan – indicates that no Range Rings or Range Plates are attached. It is

sometimes referred to as Open (22) Range since its diameter is 22 inches.

outdoors

Outside the building in the area around the building.

Manual Speed Control

Knob

The dial that is on a Fan Top to control fan speed

Manual Speed Control

Accessory

Separate fan speed controller with a knob to control the speed, provided as an optional accessory if user does

not want to use a gauge as speed controller

Pascal (Pa)

Often shown as “Pa”. A very small metric unit of pressure. There are 249 Pascals in 1 inch of Water Column

(the pressure required to push water up 1” in a tube). One Pascal = 0.000145 psi.

Pressurization

The process of creating a positive pressure in the house by blowing air into the enclosure. Air is pushed out

through all the leaks, causing the smoke to move away from the operator when checked with an air current

tester

Range configuration

The Range Plate or Range Ring that is used on the fan during a Door Fan test. See Retrotec’s Fan Range

Configuration QuickGuide

Range Plate

The Range attachment on the Retrotec Door Fan, which holds Ranges C8, C6, C4, C3, C2, C1, L4, L2, and L1. See

Retrotec’s Fan Range Configuration QuickGuide.

Range Ring

The plastic Range attachments on the Retrotec Door, which include Range A and Range B. See Retrotec’s Fan

Range Configuration QuickGuide.

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