A line powered data access arrangement is disclosed which adaptively allows proper operation with power supplied from a telephone line as conditions warrant, while at the same time satisfying the relevant requirements of many countries. Namely, the compound has a current If inhibitory effect and is particularly useful as a cardiac rate lowering agent for preventing ischemic heart diseases such as angina and cardiac infarction and circulatory diseases such as congestive cardiac insufficiency and arrhythmia. The fan type blower is operable to send air from the air inlet through the hollow space and out through the air outlet.