This is extremely important. It may not always be possible, but do the best you can with your resources. If you have wood cases that emit fumes, block them. Aged oak can release acetic acid for 800 years. Although a wood product's acid and aldehyde emissions are decreased with age, a fresh cut or hole exposes new wood, emitting more fumes.
Metal films are best for blocking wood fumes.
Special multi-laminate plastic films, such as Aclar, also work. Neither do most paints or coatings. They lessen, but do not eliminate, the problem. Only testing indicates how much each method of prevention works. Pollutants also can be removed by forcing air through or over a bed of absorbent.