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HC5

Control of Wood Dust From Shapers

Wood shapers are a major source of wood dust emissions. Workers exposed to wood dusts have
experienced a variety of adverse health effects such as eye and skin irritation, allergy, reduced
lung function, asthma, and nasal cancer. Therefore, the National Institute for Occupational

Safety and Health* (NIOSH) recommends limiting wood dust exposures to prevent these health
problems.

BARI conrnos

Surveys by NIOSH researchers found that the dust from wood shapers tends to be poorly
controlled. The amount of wood dust emitted was found to depend on the sharpness of the
cutter, the depth of the cut, the rate at which the wood is fed into the shaper, and the location of

the exhaust hood . After studying the usual hood exhaust placement, researchers developed an
improved hood configuration that significantly reduced wood dust emissions.

@ MODIFIED EXHAUST HOOD

Wood shaper emissions are usually controlled by an exhaust hood located at the back edge
of the work table which allows the operator to freely move the workpiece over the table.
Placing the exhaust hood nearer the cutting head would maximize dust collection, however,
this would restrict the operator's freedom ta move the workpiece. To overcome this problem,
a hood extension with a flexible face opening is added. (See ILLUSTRATION) The flexible
face opening consists of cloth-covered chains that allow the wood to pass through, but stops
the wood dust particles. The extension also increases the hood face velocity by minimizing the
open face area. This dust control device is not currently commercially available. Call NIOSH
for more information.

*NIOSH is the Federal agency responsible for conducting research and making recommendations for preventing
work-related illness and injuries. HAZARD CONTROLS are based on research studies that show reduced worker

exposure to hazardous agents or activities.

Pini 9
2 % U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES
i Public Health Service
% Centers for Disease Control and Prevention
enn National Institute for Occupational Safety and Health SENTERS FOR DISEASE GOWTHOL

September 1996


ILLUSTRATION: VIEW OF WOOD SHAPER WITH HOOD EXTENSION

EXHAUST

HOOD EXTENSION

CUTTING HEAD
WORK PIECE

WORK TABLE

CLOTH COVERED CHAIN

Illustrator: Daniel S. Watkins

For More Information

To obtain more information about controlling this hazard, or for information on other occupational
health and safety issues, call NIOSH at:

1-800-35-NIOSH (1-800-356-4674)

A technical article Dust Controls for a Wood Shaper, Appl. Ind. Hyg. J. 2(4):164-169(1987), has
been published on this subject.

This document is one in a series of seven HAZARD CONTROLS concerning wood dust contral
techniques listed below that are available free upon request from NIOSH:

HC4 Control of Wood Dust fram Horizontal Belt Sanders

HC5 Control of Wood Dust from Shapers

HC6 Control of Wood Dust from Automated Routers

HC7 Control of Wood Dust from-Large Diameter Disc Sanders
HC8 Control of Wood Dust from Random Orbital Hand Sanders
HC9 Control of Wood Dust from Orbital Hand Sanders

HC10 Control of Wood Dust from Table Saws

Acknowledgements

The principal contributors to this HAZARD CONTROLS are Jennifer L. Topmiller, Division of
Physical Sciences and Engineering, and Jerome P. Flesch, Education and Information Division,
NIOSH.

This document is in the public domain and may be freely copied or reprinted. NIOSH encourages all
HAZARD CONTROLS be made available to all interested employers and workers.

DHHS (NIOSH) Publication No, 96-122