Who's מרן and what book is ד״ח in דברי יואל?

Question

The fourth responsum in volume 1 (Orach Chayim) of Rabbi Yoel Teitelbaum's Divre Yoel refers (near its start) to "פסקו של מרן ז״ל בד״ח ח״ב סי׳ ו׳", "the ruling of our master's (OBM) in D.Ch. volume 2 chapter 6". What author and work are referred to?

Answer 1

I couldn't find it inside, but it's quoted here as coming from Rabbi Chaim of Tzanz.

EDIT

Found it!!

It's here, Shu"t Divrei Chaim of R' Chaim of Tzanz Orach Chaim Chelek Beis Siman Vov.