| 摘要 |
<p>PURPOSE: To provide a low cost filter unit having sufficient effect with a small quantity of a granular adsorbent, composed of small sized filter and easing and low in air resistance. CONSTITUTION: A prefilter 3 for removing dust, chemical filters 4, 5, 6 composed of the granular adsorbent and a fibrous chemical filter 8 are arranged in the order from the upstream side in a passage of air to be treated in the casing 1 provided with an air inlet 2 and the outlet 9.</p> |
