Incense-burner in front of people who are praying
Question

                What is the ruling on placing an incense-burner in front of people who are praying in the mosque?
Praise be to Allah.There is nothing wrong 
    with that, and that does not come under what some fuqaha’ have mentioned 
    about it being makrooh to pray facing fire. For those who say that it is 
    makrooh to pray facing fire give the reason that that is akin to the actions 
    of the Magians (Zoroastrians) who worship fire, but the Magians do not 
    worship fire in this manner, so there is nothing wrong with putting the 
    incense burner in front of a person who is praying. There is also nothing 
    wrong with putting electrical heaters in front of a person who is praying, 
    especially if that object is put in front of the members of the congregation 
    only and not in front of the imaam.