ASHRAE Journal - ACMA Supplement - Fall 2013 - 13

Weathering

By Dan Rau
SENIOR ENGINEERING MANAGER,
RUSKIN

the Storm

with AMCA 550

L

ouvers protect air intake and exhaust
openings in buildings and equipment from
the infiltration of rain. Water that passes

the outer shell of the building can damage interior
building finishes and can also result in mold growth.
Louvers come with many varieties of components to help collect rain water and funnel it to the outside of the building shell.
Air Movement and Control Association (AMCA) International,
the trade association for louver manufacturers, offers a certified
ratings program that uses various ANSI-accredited AMCA test
standards to determine the ability of louvers to eliminate water
from the incoming air stream. In 2007, AMCA published

Standard 550 Test Method for High Velocity Wind Driven Rain
Resistant Louvers to rate water performance in hurricane-type
events. AMCA 550 was adopted by the International Mechanical Code and Florida Mechanical Code as the performance
standard for louvers in hurricane prone areas. To help ensure
building protection and code compliance, this article describes
ANSI/AMCA 550 and when it is required.
Louver Water Tests – Overview

Most louvers are rated to ANSI/ AMCA 500L for still-air water
penetration. This test evaluates when water will be pulled into
a louver by system intake velocities. ANSI/AMCA 500L also
establishes procedures for a wind-driven rain tests, which subject
louvers to system-intake velocities in combination with wind
velocities of 29 mph with a rainfall rate of 3-in./hr, or,

Figure 1 – AMCA 550 test setup.

Image courtesy of AMCA International.

Hood Deflector
610 mm
(2 ft) Min.
Lintel or CMU

Water Spray Nozzles

Louver

610 mm
(2 ft) Min.
Plastic Film
(typical 3 sides)

Wind and Water

CMU
3.05 m (10 ft) Maximum

Channel
Bucket

3.36 m (11 ft) Maximum
Wind Generator
Discharge Plane
w w w. a m c a . o r g

AMCA I n t e r nat i o na l

inmotion

Fa l l 2 0 1 3

13


http://WWW.AMCA.ORG

ASHRAE Journal - ACMA Supplement - Fall 2013

Table of Contents for the Digital Edition of ASHRAE Journal - ACMA Supplement - Fall 2013

Contents
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover1
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover2
ASHRAE Journal - ACMA Supplement - Fall 2013 - Contents
ASHRAE Journal - ACMA Supplement - Fall 2013 - 2
ASHRAE Journal - ACMA Supplement - Fall 2013 - 3
ASHRAE Journal - ACMA Supplement - Fall 2013 - 4
ASHRAE Journal - ACMA Supplement - Fall 2013 - 5
ASHRAE Journal - ACMA Supplement - Fall 2013 - 6
ASHRAE Journal - ACMA Supplement - Fall 2013 - 7
ASHRAE Journal - ACMA Supplement - Fall 2013 - 8
ASHRAE Journal - ACMA Supplement - Fall 2013 - 9
ASHRAE Journal - ACMA Supplement - Fall 2013 - 10
ASHRAE Journal - ACMA Supplement - Fall 2013 - 11
ASHRAE Journal - ACMA Supplement - Fall 2013 - 12
ASHRAE Journal - ACMA Supplement - Fall 2013 - 13
ASHRAE Journal - ACMA Supplement - Fall 2013 - 14
ASHRAE Journal - ACMA Supplement - Fall 2013 - 15
ASHRAE Journal - ACMA Supplement - Fall 2013 - 16
ASHRAE Journal - ACMA Supplement - Fall 2013 - 17
ASHRAE Journal - ACMA Supplement - Fall 2013 - 18
ASHRAE Journal - ACMA Supplement - Fall 2013 - 19
ASHRAE Journal - ACMA Supplement - Fall 2013 - 20
ASHRAE Journal - ACMA Supplement - Fall 2013 - 21
ASHRAE Journal - ACMA Supplement - Fall 2013 - 22
ASHRAE Journal - ACMA Supplement - Fall 2013 - 23
ASHRAE Journal - ACMA Supplement - Fall 2013 - 24
ASHRAE Journal - ACMA Supplement - Fall 2013 - 25
ASHRAE Journal - ACMA Supplement - Fall 2013 - 26
ASHRAE Journal - ACMA Supplement - Fall 2013 - 27
ASHRAE Journal - ACMA Supplement - Fall 2013 - 28
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover3
ASHRAE Journal - ACMA Supplement - Fall 2013 - Cover4
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