Benefits:
Lord Hanuman is the giver of prosperity and taker of your sorrows. Other than this, by appeasing him with Hanuman Gayatri Mantra and Havan, on can seek the following benefits:
•    This puja brings abundance and prosperity to lives of the devotees
•    It attracts wealth and riches
•    It enhances one's career and business prospects
•    It ensures flourishing and high-paying jobs
•    This puja will eradicate negative and paranormal energies for your life
•    This puja protects you from black magic and other occults
•    This puja creates a shield against all sorts of miseries
•    It increases your confidence and wisdom

Prasad:
The Prasad will include:
•    Energized reel of a holy string known as “Kalava”
•    Sindoor or orange Vermilion
•    Holy Yajna ashes from the Homa fire
•    Prasad that has been offered to Lord Hanuman
•    An energized idol of Lord Hanuman

About the puja:
Lord Hanuman, the epitome of strength and courage, is believed to be the most excelled devotee of Lord Rama. This eleventh incarnation of Lord Shiva is considered as one of the strongest gods of all. It is believed that by appeasing Lord Hanuman, one can absolve all his sins and seek mukti from all his difficulties and sorrows.
Hanuman Gayatri Mantra:
ओम् आंजनेयाय विद्मिहे वायुपुत्राय धीमहि |
तन्नो: हनुमान: प्रचोदयात ||
Chanting this mantra for 108 times (1 maala) along with Hanuman havan brings amazing positivity in your life and you can witness huge changes in your life.