Aprilaire Model 500 M Whole-house Bypass Humidifier with Manual Control<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Delivers optimum levels of humidity control with the Automatic Digital Humidifier Control </span></li><li><span class="a-list-item"> Humidifies tightly constructed homes up to 3，000 square foot in size </span></li><li><span class="a-list-item"> Has an evaporation capacity of 0.50 gallons per hour </span></li><li><span class="a-list-item"> Provides vital service， temperature and relative humidity indicators in manual mode as well </span></li><li><span class="a-list-item"> Incorporates easy right or left discharge change-over </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Dm4OIZ2WL.jpg" noproxy>